Detailed instructions for use are in the User's Guide.
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
fx-82SOLAR fx-85B fx-260SOLAR fx-280
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท
ยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยทยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
ยทยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท ยท
NQPOR
fx-82SOLAR/ fx-260SOLAR
fx-85B/fx-280
ENGLISH ESPAรOL FRANรAIS
1 36 73
DEUTSCH 110 ITALIANO 147
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
ยท Your calculator is made up of precision components. Never try to take it apart. ยท Avoid dropping your calculator and otherwise subjecting it to strong impact. ยท 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. ยท 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 operations are being performed correctly. ยท Never leave the dead battery (fx-85B/fx-280) in the battery compartment. It can leak and damage the unit. ยท 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 detergent and wring out. ยท 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/fx280), or insufficient light. The user should prepare physical records of data to protect against such data loss. ยท Never dispose of battery (fx-85B/fx-280), the liquid crystal panel, or other components by burning them. ยท 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. ยท The contents of this manual are subject to change without notice. ยท No part of this manual may be reproduced in any form without the express written consent of the manufacturer. ยท Keep this manual on hand for future reference.
Modes
Application
Standard deviation calculations Normal calculations Calculations using degrees Calculations using radians Calculations using grads Number of decimal place specification Number of significant digit specification Cancels FIX and SCI settings Key Operation Mode Name* SD COMP DEG RAD GRA FIX SCI NORM
Fl F0 F4 F5 F6 F7 F8 F9
* Display indicators show current mode setting. Absence of display indicator indicates COMP Mode. --3--
Note!
ยท A mode guide is located at the top of the display screen. ยท DEG, RAD, and GRA modes can be used in combination with COMP and SD modes. ยท F9 does not exit SD mode. ยท F0 exits SD mode. ยท F0 does not clear SCI or FIX specifications. ยท Always press t before entering DEG, RAD, and GRA modes. ยท Remember to always set the operating mode and angular unit (DEG, RAD, GRA) before starting your calculation.
--4--
Basic Calculations
ยท Use the COMP mode for basic calculations. ยท Example 1: 23 4.5 53 23 + 4.5 , 53 = ยท Example 2: 56 ( 12)ร( 2.5) 56 -12 E \ 2.5 E = ยท Example 3: 2ร3 (1 1020) 2 \ 3 -1 e 20 = 6.66666666719 ยท Example 4: 7 8 4 5=36 7-8,4-5= ยท Example 5: 6 =0.3 45 4-5 \6AN =
ยญ25.5
268.8
36.
0.3
ยท Example 6: 2 [7 6 (5 4)] 122 2-O7+6-
O 5+ 4PP =
ยท You can skip all P operations before the = key. --5--
122.
ยท Example 7: 4/353 4\3 -Ax- 5AN =
523.5987756
Constant Calculations
ยท Press +, ,, - or \ twice after inputting a number to make that number a constant. ยท "K" is on the display while a constant is being used. ยท Use the COMP mode for constant calculations. ยท Example 1: 2.3 3, then 2.3 6
(2.3 3) (2.3 6)
2.3 + + 3 = 6=
K K
5.3 8.3
ยท Example 2: 12 2.3, then 12 ( 9)
(12 2.3) (12 ( 9))
12 - - 2.3 = 9E=
K K
27.6 ยญ108.
ยท Example 3: 17 17 17 17 68
(17 17) (17 17 17) (17 17 17 17)
17 + + =
K K K
34. 51. 68.
= =
--6--
ยท Example 4: 1.74 8.3521
(1.7 2) (1.7 )
3
1.7 - - =
K K K
2.89 4.913 8.3521
= =
(1.7 4)
Memory Calculations
ยท Use the COMP mode for memory calculations. ยท Use A Y, |, A { and Z for memory calculations. A Y replaces current memory contents. ยท "M" appears when there is a value in memory. ยท To clear memory, press 0 A Y or t A Y. ยท Example 1: (53 6) (23 8) (56 2) (99ร4) 210.75
(53 6) (23 8) (56 2) (99 4) (Memory recall)
53 + 6 = A Y 23 , 8 | 56 - 2 | 99 \ 4 |
M M M M M
59. 15. 112. 24.75 210.75
Z
ยท Example 2: To calculate the following using memory as shown.
--7--
M
13.
ยท Example 3: To calculate the following using memory and a constant: (12 3) (45 3) (78 3) 135.
(12 3) (45 3) (78 3) (Memory recall)
3 - - 12 = A Y 45 A { 78 |
MK MK MK MK
36. 135. 234. 135.
Z
kAdditional fx-85B/fx-280 Memory Calculations
ยท The fx-85B/fx-280 has two additional memories named A and B. ยท Use A J to store data and 0 to recall data. ยท Storing data in a memory replaces anything stored there previously. ยท To clear a memory, store a zero in it. ยท Example 1: To input 123 in memory A.
t 123 A J 1
--8--
123.
t01
ยท Example 2: To store the results of 123
123.
456 in memory B.
t 123 - 456 A J 2 t02
56088. 56088.
Fraction Calculations
ยท Use COMP mode for fraction calculations. ยท Total number of digits (including division marks) cannot exceed 10. 2 4 7 ยท Example 1: 3 5 115 1 7 15. 2C3+4C5= ยท Example 2: 3 1 4 1 2 3 4 11 12
3C1C4+ 1C2C3= ยท Example 3: 2 4 ยท Example 4: 1 2 1 2 1.6 2.1 1 C 2 + 1.6 = 2C4
4 11 12. 2 4. 1 2.
=
2.1
Fraction/decimal calculation result is always decimal. --9--
ยท Example 5:
1 0.5(Fraction Decimal) 2 1C2=
1 2. 0.5 1 2.
C C
ยท Example 6: 1 2 5 3 3 1C 2C 3
1 2 3. 5 3. 1 2 3.
AB AB
Percentage Calculations
ยท Use COMP mode for percentage calculations. ยท Example 1: To calculate 12% of 1500. 1500 - 12 A v
180.
ยท Example 2: To calculate what percentage of 880 is 660. 660 \ 880 A v ยท Example 3: To add 15% onto 2500. 2500 - 15 A v + -- 10 --
75.
2875.
ยท Example 4: To discount 3500 by 25%. 3500 - 25 A v ,
2625.
ยท Example 5: To calculate the following using a constant. 12% of 1200 = 144 18% of 1200 = 216 23% of 1200 = 276
(12%) (18%) (23%)
1200 - - 12 A v 18 A v 23 A v
K K K
144. 216. 276.
Scientific Function Calculations
ยท Use COMP mode for scientific function calculations. ยท Some calculations may take a long time to complete. ยท Wait for result before starting next calculation. ยท =3.1415926536.
kSexagesimal Functions
ยท Example 1: 14ยฐ25'36" + 12ยฐ23'34" = 26ยฐ49'10" 14 I 25 I 36 I + 12 I 23 I 34 I = -- 11 --
26ยฐ49ยฐ10.
ยท Example 2: 1ยฐ2'3" + 4.56 = 5.594166667 1 I 2 I 3 I + 4.56 =
5.594166667
ยท Example 3: sin 87ยฐ65'43.21" = 0.999447513 (DEG mode) 87 I 65 I 43.21 I S ยท Example 4: 1.23 1ยฐ13'48" 1.23 I
0.999447513
1ยฐ13ยฐ48. 1.23 1ยฐ13ยฐ48.
I I
ยท Example 5: 12ยฐ34' 12.56666667 12 I 34 I A O
12.56666667
You can also use I when inputting values to convert between sexagesimal and decimal.
kTrigonometric/Inverse Trigonometric Functions
ยท Example 1: sin ( 6 rad) (RAD mode)
RAD
Ax\6=S
-- 12 --
0.5
ยท Example 2: cos 63ยฐ52'41" (DEG mode) 63 I 52 I 41 I W ยท Example 3: tan ( 35gra)(GRA mode) 35 E h ยญ0.612800788 ยท Example 4: cosยญ1 ( 2 rad) (RAD mode) 2
RAD GRA DEG
0.440283084
2A L\2=A V
0.785398163
ยท Example 5: To convert 45 degrees to radians, grads, and back to degrees.
F 4 45
DEG
45.
RAD
A F 5 0.785398163 AF6 AF4
GRA
50.
DEG
45.
Repeated conversion between angle units can cause normally minute error to accumulate, resulting in poor precision. -- 13 --
kHyperbolic/Inverse Hyperbolic Functions
ยท Example 1: sinh 3.6 ยท Example 2: sinh
1
3.6 M S 30 M A j
18.28545536 4.094622224
30
kCommon and Natural Logarithms, Exponents
ยท Example 1: log 1.23 ยท Example 2: In 90 ( loge 90) 1.23 R 90 T
0.089905111 4.49980967 3.
Iog 64 ยท Example 3: Iog 4 64 R \ 4 R = ยท Example 4: 100.4 5 e
3
.4 A Q + 5- 3E AU= ยท Example 5: 23 ยท Example 6: 2
3
2.760821773 8. 0.125 22026.46579
2w3= 2w3E= 10 A U
ยท Example 7: e10
-- 14 --
ยท Example 8: log sin 40ยฐ + log cos 35ยฐ (DEG mode) 40 S R +35 W R = ยญ0.278567983
To convert to antilogarithm:
DEG
A Q 0.526540784
8As3=
DEG
ยท Example 9: 81/3
2.
k Square Roots, Cube Roots, Squares, Reciprocals and Factorials
ยท Example 1: 2 3 5
2AL+3 AL- 5A L= ยท Example 2: 3 5
3
5.287196909
27
5 A D + 27 E A D = ยญ1.290024053 ยท Example 3: 123 302 123 + 30 K = 1 ยท Example 4: 1 3 1 4
1023.
3AX, 4A X=
AX
-- 15 --
12.
ยท Example 5: 8!
8 Af
40320.
kFIX, SCI, NORM, RND, RAN#, ENG Calculations
ยท Example 1: 1.234 1.234, rounding result to two places (FIX 2).
F72
1.234 +1.234 =
FIX
0.00
FIX
2.47
ยท Example 2: 1.234 1.234, rounding input to two places.
F 7 2 1.234 A b +
1.234 A b = ยท Press F 9 to clear FIX specification. ยท Example 3: 1ร 3 , displaying result with two significant digits (SCI 2).
FIX
2.46
F82
1 \3 = ยท Press F 9 to clear SCI specification.
SCI
0.0 00
SCI
3.3ยญ01
-- 16 --
ยท Example 4: To convert 56,088 meters to kilometers. 56088 A J
56.088 03
ยท Example 5: To convert 0.08125 grams to milligrams. .08125 A J
81.25ยญ03
ยท Example 6: To generate a random number between 0.000 and 0.999.
Example (results differ each time)
Ac
0.664
kCoordinate Conversion
ยท Example 1: To convert polar coordinates (r 2, rectangular coordinates (x, y). (DEG mode) x y 2 A z 60 = 60ยฐ) to
DEG
1.
DEG
AN
1.732050808
A N swaps displayed value with value in memory.
ยท Example 2: To convert rectangular coordinates (1, 3) to polar coordinates (r, ). (RAD mode) r 1Ay 3AL =
RAD
2.
-- 17 --
A N 1.047197551
RAD
kPermutation
ยท Example: To determine how many different 4-digit values can be produced using the numbers 1 through 7. 7Am4=
840.
kCombination
ยท 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)
ยท Press F l to enter the SD Mode for statistical calculations using standard deviation. ยท If FIX or SCI is on the display, press F 9 first. ยท Data input always starts with A u. ยท Example: To calculate n 1, n, o, n, x, and following data : 55, 54, 51, 55, 53, 53, 54, 52.
Enter SD Mode.
x2 for the
Fl
-- 18 --
0.
SD
Input Data.
A u 55 } 54 } 51 } 55 } 53 } }
54 } 52 }
SD
52.
SD
Sample standard deviation
Aq Ap A` Ar Ao Aa
1.407885953
SD
Population standard deviation
1.316956719
SD
Arithmetic mean
53.375
SD
Number of data
8.
SD
Sum of values
427.
SD
Sum of squares of values
22805.
ยท } } inputs the same data twice (as above). ยท You can also input multiple entries of the same data using -. To input the data 110 ten times, for example, press 110 -10 }. ยท The above results can be obtained in any order, and not necessarily that shown above. ยท To delete data you have just input, press A [.
-- 19 --
kMaking Corrections During Data Input
ยท Example 1: To change data you have just input. Correct 51 } 130 31 } 130 31 } Actual 50 } 120 120 31 Correction
A[ 51 } t130 31 }
t130 31 }
ยท Example 2: To change data you previously input. Correct 51 } 130 31 } Actual 49 } 120 30 } Correction 49 A [ 51 } 120 - 30 A [130 31 }
-- 20 --
Technical Information
kKeys and Their Functions
ยท General Arithmetic calculations .......................... +, ,, -, ............. \, = Backspace ............................................ Q Clear(retains memory) .......................... k Number input ........................................ 0 ยญ 9, l Power on; All clear ................................ t Sign change .......................................... E ยท Memory Memory in ............................................. A Y Memory minus ...................................... A { Memory plus ......................................... | Memory recall ....................................... Z ยท fx-85B/fx-280 Memory Memory A recall .................................... 0 1 Memory B recall ................................. ...
