Casio Scientific Calculator FX 85B User Manual

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fx-82SOLAR  
fx-85B  
fx-260SOLAR  
fx-280  
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NQPOR  
CASIO ELECTRONICS CO., LTD.  
Unit 6, 1000 North Circular Road,  
London NW2 7JD, U.K.  
Contents  
Handling Precautions … 2  
Modes … 3  
Basic Calculations … 5  
Constant Calculations … 6  
Memory Calculations … 7  
Fraction Calculations … 9  
Percentage Calculations … 10  
Scientific Function Calculations … 11  
Statistical Calculations (SD Mode) … 18  
Technical Information … 21  
— 1 —  
Handling Precautions  
Your calculator is made up of precision components. Never  
try to take it apart.  
• Avoid dropping your calculator and otherwise subjecting it  
to strong impact.  
• Do not store the calculator or leave it in areas exposed to  
high temperature or humidity, or large amounts of dust.  
When exposed to low temperatures, the calculator may  
require more time to display results and may even fail to  
operate. Correct operation will resume once the calculator  
is brought back to normal temperature.  
• The display will go blank and keys will not operate during  
calculations.When you are operating the keyboard, be sure  
to watch the display to make sure that all your key opera-  
tions are being performed correctly.  
• Never leave the dead battery (fx-85B/fx-280) in the battery  
compartment. It can leak and damage the unit.  
• Avoid using volatile liquids such as thinner or benzine to  
clean the unit. Wipe it with a soft cloth, or with a cloth that  
has been dipped in a solution of water and a neutral deter-  
gent and wring out.  
• In no event will the manufacturer and its suppliers be liable  
to you or any other person for any damages, expenses,  
lost profits, lost savings, or any other damages arising out  
of malfunction, repairs, or battery replacement (fx-85B/fx-  
280), or insufficient light. The user should prepare physical  
records of data to protect against such data loss.  
• Never dispose of battery (fx-85B/fx-280), the liquid crystal  
panel, or other components by burning them.  
• Before assuming malfunction of the unit, be sure to care-  
— 2 —  
fully reread this manual and ensure that the problem is not  
due to low battery power (fx-85B/fx-280) or operational  
error.  
• The contents of this manual are subject to change without  
notice.  
• No part of this manual may be reproduced in any form  
without the express written consent of the manufacturer.  
Keep this manual on hand for future reference.  
Modes  
Key  
Operation  
Mode  
Name*  
Application  
Standard deviation calculations  
Normal calculations  
SD  
COMP  
DEG  
RAD  
GRA  
Fl  
F0  
F4  
F5  
F6  
Calculations using degrees  
Calculations using radians  
Calculations using grads  
Number of decimal place  
specification  
FIX  
F7  
Number of significant digit  
specification  
SCI  
F8  
F9  
Cancels FIX and SCI settings  
NORM  
* Display indicators show current mode setting. Absence of  
display indicator indicates COMP Mode.  
— 3 —  
Note!  
• A mode guide is located at the top of the display screen.  
• DEG, RAD, and GRA modes can be used in combination  
with COMP and SD modes.  
does not exit SD mode.  
exits SD mode.  
does not clear SCI or FIX specifications.  
F9  
F0  
F0  
• Always press  
modes.  
before entering DEG, RAD, and GRA  
t
• Remember to always set the operating mode and angular  
unit (DEG, RAD, GRA) before starting your calculation.  
— 4 —  
Basic Calculations  
• Use the COMP mode for basic calculations.  
Example 1: 23ѿ4.5Ҁ53  
23 + 4.5 , 53 =  
–25.5  
268.8  
Example 2: 56҂(Ҁ12)Ö(Ҁ2.5)  
56 -12 E \ 2.5 E =  
Example 3: 2Ö3҂(1҂1020)  
6.66666666719  
2 \ 3 -1 e 20 =  
Example 4: 7҂8Ҁ4҂5=36  
7 - 8 , 4 - 5 =  
36.  
0.3  
6
4҂5  
Example 5:  
=0.3  
4 - 5 \ 6 A N =  
Example 6: 2҂[7ѿ6҂(5ѿ4)]҃122  
2 - O 7 + 6 -  
O 5 + 4 P P =  
122.  
You can skip all P operations before the = key.  
— 5 —  
Example 7: 4/3π53  
4 \ 3 - A x - 5 A N =  
523.5987756  
Constant Calculations  
• Press +, ,, - or \ twice after inputting a number to  
make that number a constant.  
• “K” is on the display while a constant is being used.  
• Use the COMP mode for constant calculations.  
Example 1: 2.3ѿ3, then 2.3ѿ6  
K
(2.3ѿ3)  
2.3 + + 3 =  
5.3  
8.3  
K
(2.3ѿ6)  
6 =  
Example 2: 12҂2.3, then 12҂(ȕ9)  
K
K
(12҂2.3)  
12 - - 2.3 =  
27.6  
(12҂(ȕ9))  
9 E =  
–108.  
Example 3: 17ѿ17ѿ17ѿ17҃68  
K
K
K
(17ѿ17)  
17 + + =  
34.  
51.  
68.  
(17ѿ17ѿ17)  
(17ѿ17ѿ17ѿ17)  
=
=
— 6 —  
Example 4: 1.74҃8.3521  
K
K
K
(1.72)  
(1.73)  
(1.74)  
1.7 - - =  
2.89  
4.913  
=
=
8.3521  
Memory Calculations  
• Use the COMP mode for memory calculations.  
• Use A Y, |, A { and Z for memory calculations.  
A Y replaces current memory contents.  
• “M” appears when there is a value in memory.  
To clear memory, press 0 A Y or t A Y.  
Example 1: (53ѿ6)ѿ(23Ҁ8)ѿ(56҂2)ѿ(99Ö4)҃210.75  
M
(53ѿ6)  
53 + 6 = A Y  
23 , 8 |  
56 - 2 |  
99 \ 4 |  
Z
59.  
15.  
M
M
M
M
(23ȕ8)  
(56҂2)  
112.  
(99Ȗ4)  
24.75  
210.75  
(Memory recall)  
Example 2: To calculate the following using memory as  
shown.  
— 7 —  
M
13.  
Example 3: To calculate the following using memory and  
a constant: (12҂3)ȕ(45҂3)ѿ(78҂3)҃135.  
MK  
(12҂3)  
3 - - 12 = A Y  
36.  
135.  
234.  
135.  
MK  
MK  
MK  
(45҂3)  
45 A {  
78 |  
Z
(78҂3)  
(Memory recall)  
kAdditional fx-85B/fx-280 Memory Calculations  
• The fx-85B/fx-280 has two additional memories named A  
and B.  
• Use A J to store data and 0 to recall data.  
• Storing data in a memory replaces anything stored there  
previously.  
To clear a memory, store a zero in it.  
Example 1: To input 123 in memory A.  
t 123 A J 1  
123.  
— 8 —  
t 0 1  
123.  
Example 2: To store the results of 123 ҂ 456 in memory B.  
t 123 - 456 A J 2  
56088.  
56088.  
t 0 2  
Fraction Calculations  
• Use COMP mode for fraction calculations.  
Total number of digits (including division marks) cannot  
exceed 10.  
2
3
4
5
7
Example 1:  
ѿ
҃1  
15  
2 C 3 + 4 C 5 =  
1 7 15.  
1
4
2
3
11  
12  
Example 2: 3  
ѿ1  
҃4  
3 C 1 C 4 +  
1 C 2 C 3 =  
4 11 12.  
2
Example 3:  
4
1
2
҃
2 C 4  
2 4.  
1 2.  
=
1
Example 4:  
2
ѿ1.6҃2.1  
1 C 2 + 1.6 =  
2.1  
Fraction/decimal calculation result is always decimal.  
— 9 —  
1
2
Example 5:  
0.5(Fraction Decimal)  
1 C 2 =  
C
1 2.  
0.5  
C
1 2.  
2
3
5
Example 6: 1  
3
1 C 2 C 3  
A B  
1 2 3.  
5 3.  
A B  
1 2 3.  
Percentage Calculations  
• Use COMP mode for percentage calculations.  
Example 1: To calculate 12% of 1500.  
1500 - 12 A v  
180.  
Example 2: To calculate what percentage of 880 is 660.  
660 \ 880 A v  
75.  
Example 3: To add 15% onto 2500.  
2500 - 15 A v +  
2875.  
— 10 —  
Example 4: To discount 3500 by 25%.  
3500 - 25 A v ,  
2625.  
Example 5: To calculate the following using a constant.  
12% of 1200 = 144  
18% of 1200 = 216  
23% of 1200 = 276  
K
(12%)  
(18%)  
(23%)  
1200 - - 12 A v  
18 A v  
144.  
216.  
276.  
K
K
23 A v  
Scientific Function Calculations  
• Use COMP mode for scientific function calculations.  
• Some calculations may take a long time to complete.  
• Wait for result before starting next calculation.  
=3.1415926536.  
kSexagesimal Functions  
Example 1: 14°25’36” + 12°23’34” = 26°49’10”  
14 I 25 I 36 I +  
12 I 23 I 34 I =  
26°49°10.  
— 11 —  
Example 2: 1°2’3” + 4.56 = 5.594166667  
1 I 2 I 3 I + 4.56 =  
5.594166667  
Example 3: sin 87°65’43.21” = 0.999447513 (DEG mode)  
87 I 65 I 43.21 I S  
0.999447513  
Example 4: 1.231°13’48”  
1.23 I  
I
1°13°48.  
1.23  
I
1°13°48.  
Example 5: 12°34’ 12.56666667  
12 I 34 I A O  
12.56666667  
You can also use I when inputting values to convert be-  
tween sexagesimal and decimal.  
kTrigonometric/InverseTrigonometric  
Functions  
6
Example 1: sin (  
rad) (RAD mode)  
RAD  
A x \ 6 = S  
0.5  
— 12 —  
Example 2: cos 63°52’41” (DEG mode)  
DEG  
63 I 52 I 41 I W  
0.440283084  
Example 3: tan (ȕ35gra)(GRA mode)  
GRA  
35 E h  
–0.612800788  
2
2
Example 4: cos–1  
(
rad) (RAD mode)  
RAD  
2 A L \ 2 = A V  
0.785398163  
Example 5: To convert 45 degrees to radians, grads, and  
back to degrees.  
DEG  
F 4 45  
45.  
RAD  
A F 5  
0.785398163  
GRA  
A F 6  
50.  
DEG  
A F 4  
45.  
Repeated conversion between angle units can cause nor-  
mally minute error to accumulate, resulting in poor preci-  
sion.  
— 13 —  
kHyperbolic/Inverse Hyperbolic Functions  
3.6 M S  
Example 1: sinh 3.6  
18.28545536  
Example 2: sinhҀ1 30 30 M A j 4.094622224  
kCommon and Natural Logarithms, Exponents  
Example 1: log 1.23  
1.23 R  
0.089905111  
4.49980967  
Example 2: In 90 (҃loge 90) 90 T  
Iog 64  
Iog 4  
Example 3:  
64 R \ 4 R =  
3.  
Example 4: 100.4ѿ5 eȕ3  
.4 A Q +  
5 - 3 E A U =  
2.760821773  
8.  
Example 5: 23  
Example 6: 2ȕ3  
Example 7: e10  
2 w 3 =  
2 w 3 E =  
0.125  
10 A U  
22026.46579  
— 14 —  
Example 8: log sin 40° + log cos 35° (DEG mode)  
DEG  
40 S R +35 W R =  
–0.278567983  
DEG  
To convert to antilogarithm:  
A Q  
0.526540784  
Example 9: 81/3  
8 A s 3 =  
2.  
kSquare Roots, Cube Roots, Squares,  
Reciprocals and Factorials  
Example 1: 2ѿ 3҂ 5  
2 A L + 3 A L - 5 A L = 5.287196909  
Example 2: 3 5ѿ3 ȕ27  
5 A D + 27 E A D =  
–1.290024053  
1023.  
Example 3: 123ѿ302  
123 + 30 K =  
1
Example 4:  
1
3
1
4
ȕ
3 A X , 4 A X =  
A X  
12.  
— 15 —  
Example 5: 8!  
8 A f  
40320.  
kFIX, SCI, NORM, RND, RAN#, ENG  
Calculations  
Example 1: 1.234ѿ1.234, rounding result to two places  
(FIX 2).  
FIX  
F 7 2  
0.00  
FIX  
1.234 +1.234 =  
2.47  
Example 2: 1.234ѿ1.234, rounding input to two places.  
F 7 2 1.234 A b +  
FIX  
1.234 A b =  
2.46  
• Press F 9 to clear FIX specification.  
Example 3: 1Ö 3 , displaying result with two significant  
digits (SCI 2).  
SCI  
0.0 00  
F 8 2  
SCI  
3.3–01  
1 \ 3 =  
• Press F 9 to clear SCI specification.  
— 16 —  
Example 4: To convert 56,088 meters to kilometers.  
56.088 03  
56088 A J  
Example 5: To convert 0.08125 grams to milligrams.  
81.25–03  
.08125 A J  
Example 6: To generate a random number between 0.000  
and 0.999.  
Example (results differ each time)  
A c  
0.664  
kCoordinate Conversion  
Example 1: To convert polar coordinates (r҃2, ҃60°) to  
rectangular coordinates (x, y). (DEG mode)  
DEG  
x
y
2 A z 60 =  
1.  
1.732050808  
DEG  
A N  
A N swaps displayed value with value in memory.  
Example 2: To convert rectangular coordinates (1, 3) to  
polar coordinates (r, ). (RAD mode)  
RAD  
r
1 A y 3 A L =  
2.  
— 17 —  
RAD  
θ
A N  
1.047197551  
kPermutation  
Example: To determine how many different 4-digit values  
can be produced using the numbers 1 through 7.  
7 A m 4 =  
840.  
kCombination  
Example: To determine how many different 4-member  
groups can be organized in a group of 10 individuals.  
10 A n 4 =  
210.  
Statistical Calculations (SD Mode)  
• Press F l to enter the SD Mode for statistical calcula-  
tions using standard deviation.  
• If FIX or SCI is on the display, press F 9 first.  
• Data input always starts with A u.  
Example: To calculate nҀ1, n, o, n, x, and x2 for the  
following data : 55, 54, 51, 55, 53, 53, 54, 52.  
SD  
0.  
Enter SD Mode.  
F l  
— 18 —  
Input Data.  
A u 55 }  
54 } 51 }  
55 } 53 } }  
SD  
54 } 52 }  
52.  
SD  
Sample standard deviatio  
Population standard deviation  
Arithmetic mean  
n
A q  
1.407885953  
SD  
A p  
A `  
A r  
A o  
A a  
1.316956719  
SD  
53.375  
SD  
Number of data  
8.  
SD  
Sum of values  
427.  
SD  
Sum of squares of values  
22805.  
} } inputs the same data twice (as above).  
You can also input multiple entries of the same data using  
-. To input the data 110 ten times, for example, press  
110 -10 }.  
• The above results can be obtained in any order, and not  
necessarily that shown above.  
To delete data you have just input, press A [.  
— 19 —  
kMaking Corrections During Data Input  
Example 1: To change data you have just input.  
Correct  
Actual  
50 }  
Correction  
51 }  
A [  
51 }  
130 -  
120 -  
t130 -  
31 }  
31 }  
130 -  
120 -  
t130 -  
31 }  
31  
31 }  
Example 2: To change data you previously input.  
Correct  
Actual  
49 }  
Correction  
49 A [  
51 }  
51 }  
130 -  
31 }  
120 -  
30 }  
120 - 30 A [130 -  
31 }  
— 20 —  
Technical Information  
kKeys and Their Functions  
General  
Arithmetic calculations .......................... +, ,, -,  
............. \, =  
Backspace ............................................ Q  
Clear(retains memory) .......................... k  
Number input ........................................ 09, l  
Power on; All clear ................................ t  
Sign change .......................................... E  
Memory  
Memory in ............................................. A Y  
Memory minus ...................................... A {  
Memory plus ......................................... |  
Memory recall ....................................... Z  
fx-85B/fx-280 Memory  
Memory A recall .................................... 0 1  
Memory B recall .................................... 0 2  
Memory M recall ................................... 0 3  
Memory A store ..................................... A J 1  
— 21 —  
Memory B store..................................... A J 2  
Memory M store .................................... A J 3  
Special  
Display/memory swap ........................... A N,  
A d  
Exponent ............................................... e  
Internal rounding ................................... A b  
Parentheses .......................................... O, P  
Pi (3.1415926536) ................................ A x  
Select mode .......................................... F  
Sexagesimal ......................................... I, A O  
Shifts key functions ............................... A  
• Scientific Functions  
Arc cosine ............................................. A V  
Arc sine ................................................. A j  
Arc tangent............................................ A g  
Common antilogarithm .......................... A Q  
Common logarithm ................................ R  
Convert to degrees ................................ A F 4  
Convert to grads.................................... A F 6  
Convert to radians ................................. A F 5  
Cosine ................................................... W  
— 22 —  
Cube ..................................................... A N  
Cube root .............................................. A D  
Engineering ........................................... A J,  
A P  
Factorial ................................................ A f  
Fraction ................................................. C  
Fraction ................................................. A B  
Hyperbolic ............................................. M  
Natural antilogarithm ............................. A U  
Natural logarithm ................................... T  
Percent .................................................. A v  
Polar-to-rectangular .............................. A z  
Power .................................................... w  
Random number ................................... A c  
Reciprocal ............................................. A X  
Rectangular-to-polar ............................. A y  
Root ...................................................... A s  
Sine ....................................................... S  
Square .................................................. K  
Square root ........................................... A L  
Tangent ................................................. h  
Permutation ........................................... A m  
Combination .......................................... A n  
— 23 —  
• Statistics (SD Mode)  
Arithmetic mean .................................... A `  
Data delete............................................ A [  
Data input.............................................. }  
Number of data ..................................... A r  
Population standard deviation............... A p  
Sample standard deviation .................... A q  
Statistical register clear ......................... A u  
Sum of squares of values ..................... A a  
Sum of values ....................................... A o  
kExponential Display Formats  
This calculator can display up to 10 digits. Larger values are  
automatically displayed using exponential notation. In the  
case of decimal value, you can select between two formats  
that determine at what point exponential notation is used.  
• NORM 1  
With NORM 1, exponential notation is automatically used  
for integer values with more than 10 digits and decimal values  
with more than two decimal places.  
• NORM 2  
With NORM 2, exponential notation is automatically used  
for integer values with more than 10 digits and decimal values  
with more than nine decimal places.  
— 24 —  
To switch between NORM 1 and NORM 2  
Press F 9. There is no indication on the display of which  
format is currently in effect, but you can determine the setting  
by performing the following calculation.  
5. –03  
0.005  
1 \ 200 =  
NORM 1 format  
NORM 2 format  
• All of the examples in this manual show calculation results  
using the NORM 1 format.  
kWhen you have a problem...  
If calculation results are not what you expect or if an error  
occurs, perform the following steps.  
1. F 0 (COMP mode)  
2. F 4 (DEG mode)  
3. F 9 (NORM mode)  
4. Check the formula you are working with to confirm it is  
correct.  
5. Enter the correct modes to perform the calculation and  
try again.  
kMaking Corrections During Calculations  
• If you make a mistake when inputting a value (but did not  
yet press an operator key), use Qto backspace and delete  
input digits one-by-one. Or you can press k to clear the  
input entirely and start again.  
— 25 —  
• In a series of calculations, press k while an intermediate  
result is displayed to clear only the last calculation per-  
formed.  
To change the operator key (+, ,, -, \, w, As,  
etc.) you just pressed, simply press the correct operator  
key. In this case, the operator of the last key you press is  
used, but the operation retains the order of precedence of  
the operation for the first key you pressed.  
kOverflow or Error Check  
The following conditions make further calculation impossi-  
ble.  
a. When a result (whether intermediate or final) or a  
total accumulated in memory is greater than  
9.999999999 ҂ 1099. (“–E–” indicator appears on the  
display.)  
b. When function calculations are performed using a value  
that exceeds the input range. (“–E–” indicator appears  
on the display.)  
c. When an illogical operation (such as an attempt to calcu-  
late o and σn while n ҃ 0) is performed during statistical  
calculations. (“–E–” indicator appears on the display.)  
d. When an illegal mathematical operation (such as division  
by zero) is performed. (“–E–” indicator appears on dis-  
play.)  
e. The total number of nested parentheses levels exceeds  
six, or when more than 18 pairs of parentheses are used.  
(“– 1–” indicator appears on the display.)  
To clear any of the above conditions, press t and per-  
form the calculation from the beginning.  
— 26 —  
• In the case of condition e, you could also press k. This  
clears the intermediate result just prior to the overflow, so  
you can continue with the calculation from that point.  
• No error occurs when the result is within the range of  
ѿ(1҂10Ҁ99)to Ҁ(1҂10Ҁ99). Instead, the display shows all  
zeros.  
kPower Supply  
• fx-82SOLAR/fx-260SOLAR  
This calculator is powered by a solar cell that converts avail-  
able light into electrical power.  
Solar Cell Precautions  
• The solar cell requires at least 50 lux of light to provide  
power.  
• If available light is too low, the display may become dim,  
calculation functions may become impossible, or the con-  
tents of the independent memory may be lost. If this  
happens, move to an area with more light.  
• fx-85B/fx-280  
This calculator is powered by the CASIO TWO-WAY POWER  
system, which makes it possible for the calculator to operate  
even in total darkness.  
• The calculator retains memory contents no matter what  
the lighting conditions.  
• TheTWO-WAY POWER system uses two power sources:  
a solar cell and a single G13Type (SR44 or LR44) battery.  
• Weak battery power is indicated when memory contents  
spontaneously clear, or when the display darkens under  
poor light and cannot be restored by pressing 5.  
— 27 —  
Important!  
Incorrect use of batteries can cause them to burst or leak,  
possibly damaging the calculator.  
• Be sure to replace the battery at least once every three  
years, regardless of how much the calculator is used. Old  
batteries may leak, causing serious damage to the interior  
of the calculator.  
• The battery that comes with the calculator when you pur-  
chase it is for testing only. It may not provide full service  
life.  
• Low bettery power can cause memory contents to become  
corrupted or lost completely. Always keep written records  
of all important data.  
• Always be sure to load the battery with its positive (ѿ)  
side facing up (so you can see it).  
• Never try to charge batteries, take them apart, or allow  
them to become shorted. Keep batteries away from direct  
flame and heat.  
Keep batteries out of the reach of small children. If  
swallowed, consult with your physician immediately.  
Screws  
To replace the battery  
1. Remove the screws that hold the  
Battery  
back cover in place, and then re-  
move the cover.  
2. Remove the old battery.  
3. Install a new battery, making sure  
that the positive (ѿ) side is facing  
Screws  
up (so you can see it).  
4. Replace the back cover and  
secure it in place with the screws.  
— 28 —  
5. Press t to turn power on.  
kOrder of Operations and Levels  
Operations are performed in the following order of prec-  
edence.  
1. Functions  
2. xy, x1/y, R P, P R, nPr, nCr  
3. ҂, Ȗ  
4. ѿ, Ҁ  
• Operations with the same precedence are performed from  
left to right, with operations enclosed in parentheses per-  
formed first. If parentheses are nested, the operations en-  
closed in the innermost set of parentheses are performed  
first.  
• Registers L1 through L6 store operations.There are six reg-  
isters, so calculations up to six levels can be stored.  
• Each level can contain up to three open parentheses, so  
parentheses can be nested up to 18 times.  
Example: The following operation uses 4 levels and 5  
nested parentheses.  
2 - O O O 3 + 4 - O O 5 + 4  
The table on the next page shows register contents  
following the above input.  
— 29 —  
Register  
Contents  
x
4
L1  
L2  
L3  
L4  
L5  
L6  
(( 5 ѿ  
4 ҂  
((( 3 ѿ  
2 ҂  
kFormulas, Ranges, and Conventions  
The following are the formulas, ranges, and conventions that  
are applied to various calculations that can be performed  
using this calculator.  
Coordinate Transformation  
• With polar coordinates, θ can be calculated within a range  
of –180° θ 180°.The calculation range is the same for  
radians and grads.  
Y
Y
P (r,  
θ
)
P (x, y)  
Pol  
r
y
Rec  
θ
0
X
0
X
x
— 30 —  
Permutation  
• Input range: n r 0 (n, r : integers)  
n!  
• Formula: nPr ҃  
(nҀr)!  
Combination  
• Input range: n r 0 (n, r : integers)  
n!  
• Formula: nCr ҃  
n!(nҀr)!  
Population Standard Deviation  
n
2
2
x2 – (x) / n  
(xi x)  
i
҃ 1  
n ҃  
҃
n
n
Sample Standard Deviation  
n
2
2
x2 – (x) / n  
(xi x)  
n – 1  
i
҃ 1  
n 1  
҃
҃
n – 1  
Arithmetic Mean  
n
xi  
x  
n
i
҃ 1  
o ҃  
҃
n
— 31 —  
kSpecifications  
Power Supply :  
fx-82SOLAR/fx-260SOLAR : Solar cell  
fx-85B/fx-280 : CASIO TWO-WAY POWER System: solar  
cell plus one G13 Type (SR44 or LR44)  
battery  
Battery Life (fx-85B/fx-280) :  
Approximately 3 years (1 hour use per day)  
on LR44/SR44 battery  
Input Ranges :  
Functions  
Input Range  
However, for tan x:  
(DEG) ȊxȊ9҂109  
sinx  
cosx  
tanx  
ȊxȊ90(2nѿ1):DEG  
ȊxȊꢀꢂ2·(2nѿ1):RAD  
ȊxȊ100(2nѿ1):GRA  
(RAD) ȊxȊ5҂107rad  
(GRA) ȊxȊ1҂1010 grad  
sin–1x  
ȊxȊꢀ 1  
cos–1x  
ȊxȊ 1 ҂ 10100  
tan–1x  
For sinh and tanh,errors  
are cumulative and ac-  
curacy is affected at a  
certain point when x=0.  
sinhx  
coshx  
ȊxȊꢀ 230.2585092  
ȊxȊ 1҂ 10100  
tanhx  
sinh–1x ȊxȊ 5 ҂ 1099  
cosh–1x  
1x  5 ҂ 1099  
— 32 —  
Functions  
Input Range  
tanh–1x ȊxȊ 1  
1҂ 10–99 x  1 ҂ 10100  
logx/lnx  
10x  
ex  
–1҂ 10100  x  100  
–1҂ 10100  x 230.2585092  
0 x  1 ҂ 10100  
x
ȊxȊ 1҂ 1050  
ȊxȊ 2.154434690 ҂ 1033  
ȊxȊ 1҂ 10100  
ȊxȊ 1҂ 10100  
x2  
x3  
1/x  
;
x ≠  
0
3
x
0 x 69 (x is an integer)  
x!  
0 r n  
n 1҂1010  
(n and r are integers)  
nPr/nCr  
x2 ѿ y2 1҂10100  
RP  
0 r  1҂10100  
However, for tan:  
ȊȊ90(2nѿ1):DEG  
(DEG) ȊȊ9҂109  
PR  
(RAD) ȊȊ5҂107rad ȊȊꢀꢂ2·(2nѿ1):RAD  
(GRA) ȊȊ1҂1010 grad  
ȊȊ100(2nѿ1):GRA  
Input and Results  
Total of hour, minutes, and seconds digits  
must be 10 or fewer (including separator  
symbols).  
°’ ”  
Decimal Sexagesimal Conversions  
ȊxȊꢀ 2777777.777  
— 33 —  
Functions  
Input Range  
x 0: –1҂10100 y log x 100  
x ҃ 0: y 0  
x  0: y ҃ n;  
1
xy  
(n is an integer)  
2nѿ1  
However: –1҂10100  y log ȊxȊ100  
x 0:y 0  
–1҂101001/y log x 100  
x ҃ 0: y 0  
x1/y  
1
x  0: y҃ 2nѿ1; (n 0; n is an integer)  
n
However: –1҂10100 1/ylog ȊxȊ100  
Total of integer, numerator, and denominator  
must be 10 digits or less(including division  
marks).  
b
a /  
c
ȊxȊ 1҂1050  
ȊnȊ 1҂10100  
n , o : n 0  
n –1 : n 0, 1  
SD  
• Errors are cumulative with such internal continuous  
calculations as xy, x1/y, x!, and 3 x, so accuracy may be  
adversely affected.  
— 34 —  
Operating Temperature: 0°C–40°C (32°F–104°F)  
Dimensions:  
fx-82SOLAR/fx-260SOLAR:  
8(H)i66.5(W)i125(D) mm  
5/16"(H)i2-5/8"(W)i4-15/16"(D)  
fx-85B/fx-280:  
13.5(H)i73(W)i144.5(D) mm  
1/2"(H)i2-7/8"(W)i5-5/8"(D)  
Weight:  
fx-82SOLAR/fx-260SOLAR:  
47 g (1.7oz)  
fx-85B/fx-280:  
67 g (2.4oz) including battery  
Calculation Capacity:  
• Input/ Basic Calculations  
10-digit mantissa; or 10-digit mantissa plus 2-digit expo-  
99  
nent up to 10  
— 35 —  
CASIO COMPUTER CO., LTD.  
6-2, Hon-machi 1-chome,  
Shibuya-ku, Tokyo 151-8543, Japan  
SA9709-C Printed in China  
Imprimé en Chine  

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