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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: 1.23↔ 1°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 ........................................ 0– 9, 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) ȊxȊ9҂109
sinx
cosx
tanx
ȊxȊ≠ 90(2nѿ1):DEG
ȊxȊ≠ ꢀꢂ2·(2nѿ1):RAD
ȊxȊ≠ 100(2nѿ1):GRA
(RAD) ȊxȊ5҂107ꢀ rad
(GRA) ȊxȊ1҂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
1ꢀ x 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
R→P
0 ꢀ r 1҂10100
However, for tan:
ȊȊ≠ 90(2nѿ1):DEG
(DEG) ȊȊ9҂109
P→R
(RAD) ȊȊ5҂107ꢀ rad ȊȊ≠ ꢀꢂ2·(2nѿ1):RAD
(GRA) ȊȊ1҂1010 grad
ȊȊ≠ 100(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 ꢂ 0: –1҂10100 y log x 100
x ҃ 0: y ꢂ 0
x 0: y ҃ n;
1
xy
(n is an integer)
2nѿ1
However: –1҂10100 y log ȊxȊ100
x ꢂ 0:y ≠ 0
–1҂101001/y log x 100
x ҃ 0: y ꢂ 0
x1/y
1
x 0: y҃ 2nѿ1; (n ≠ 0; n is an integer)
n
However: –1҂10100 1/ylog ȊxȊ100
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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