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Manual Casio FX-280

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  • Casio FX-280 - page 1

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  • Casio FX-280 - page 2

    fx-82SOLAR/ fx-260SOLAR fx-85B/fx-280 ENGLISH 1 ESPAÑOL 36 FRANÇAIS 73 DEUTSCH 110 ITALIANO 147 ...

  • Casio FX-280 - page 3

    — 1 — 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 T echnical Inf or mation … 21 CASIO ELECTRONICS CO., LTD. Unit 6, 1000 ...

  • Casio FX-280 - page 4

    — 2 — Handling Precautions •Y our calculator is made up of precision components . Nev er tr y to take it apart. •A vo id dropping y our calculator and otherwise subjecting it to strong impact. • Do not store the calculator or lea ve it in areas exposed to high temperature or humidity , or large amounts of dust. When e xposed to low temper ...

  • Casio FX-280 - page 5

    — 3 — fully reread this man ual and ensure that the problem is not due to low battery po wer (fx-85B/fx-280) or operational error . • The contents of this man ual are subject to change without notice. •N o part of this manual ma y be reproduced in an y f orm without the e xpress wr itten consent of the manuf acturer . •K eep this manual o ...

  • Casio FX-280 - page 6

    — 4 — 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. • F9 does not exit SD mode . • F0 e xits SD mode. • F0 does not clear SCI or FIX specifications . •A l w a ys press t bef ore enter ing DEG, RAD , and GRA modes. •R emember to always ...

  • Casio FX-280 - page 7

    — 5 — Basic Calculations •U se the COMP mode f or basic calculations. • Example 1: 23  4.5  53 23 + 4.5 , 53 = • Example 2: 56  (  12)  (  2.5) 56 - 12 E 2.5 E = • Example 3: 2  3  (1  10 20 ) 2 3 - 1 e 20 = • Example 4: 7  8  4  5=36 7 - 8 , 4 - 5 = • Example 5: =0.3 4 - 5 6 A N = • Examp ...

  • Casio FX-280 - page 8

    — 6 — • Example 7: 4/3 π 5 3 4 3 - A x - 5 A N = Constant Calculations •P ress + , , , - or twice after inputting a number to mak e that number a constant. •“ K” is on the displa y while a constant is being used. •U se the COMP mode f or constant calculations. • Example 1: 2.3  3, then 2.3  6 (2.3  3) 2.3 + + 3 = (2. ...

  • Casio FX-280 - page 9

    — 7 — K 2.89 K 4.913 K 8.3521 • Example 4: 1.7 4  8.3521 (1.7 2 ) 1.7 - - = (1.7 3 ) = (1.7 4 ) = Memor y Calculations •U se the COMP mode for memory calculations. •U se A Y , | , A { and Z fo r m e mor y calculations. A Y replaces current memor y contents. •“ M” appears when there is a v alue in memor y . •T o c l ear memory , ...

  • Casio FX-280 - page 10

    — 8 — • Example 3: To calculate the follo wing using memory and a constant: (12  3)  (45  3)  (78  3)  135. (12  3) 3 - - 12 = A Y (45  3) 45 A { (78  3) 78 | (Memor y recall) Z k Additional fx-85B/fx-280 Memory Calculations • The fx-85B/fx-280 has two additional memories named A and B . •U se A J to store data ...

  • Casio FX-280 - page 11

    — 9 — t 0 1 • Example 2: To store the results of 123  456 in memor y B . t 123 - 456 A J 2 t 0 2 Fraction Calculations •U se COMP mode f or fr action calculations . •T otal n umber of digits (including division marks) cannot e xceed 10. • Example 1:   1 2 C 3 + 4 C 5 = • Example 2: 3  1  4 3 C 1 C 4 + 1 C 2 C 3 = • Ex ...

  • Casio FX-280 - page 12

    — 10 — • Example 5: ↔ 0.5(Fraction ↔ Decimal) 1 C 2 = C C • Example 6: 1 ↔ 1 C 2 C 3 A B A B Pe r centage Calculations •U se COMP mode for percentage calculations . • Example 1: To calculate 12% of 1500. 1500 - 12 A v • Example 2: To calculate what percentage of 880 is 660. 660 880 A v • Example 3: To add 15% onto 2500. 2500 ...

  • Casio FX-280 - page 13

    — 11 — • Example 4: To discount 3500 by 25%. 3500 - 25 A v , • Example 5: To calculate the f ollowing using a constant. 12% of 1200 = 144 18% of 1200 = 216 23% of 1200 = 276 (12%) 1200 - - 12 A v (18%) 18 A v (23%) 23 A v Scientific Function Calculations •U se COMP mode f or scientific function calculations . • Some calculations ma y ta ...

  • Casio FX-280 - page 14

    — 12 — • Example 2: 1°2’3” + 4.56 = 5.594166667 1 I 2 I 3 I + 4.56 = • Example 3: sin 87°65’43.21” = 0.999447513 (DEG mode) 87 I 65 I 43.21 I S • Example 4: 1.23 ↔ 1°13’48” 1.23 I I I • Example 5: 12°34’ ↔ 12.56666667 12 I 34 I A O Y ou can also use I when inputting v alues to con v er t be- tween sexagesimal and d ...

  • Casio FX-280 - page 15

    — 13 — • Example 2: cos 63°52’41” (DEG mode) 63 I 52 I 41 I W • Example 3: tan (  35gra)(GRA mode) 35 E h • Example 4: cos –1 ( r ad) (RAD mode) 2 A L 2 = A V • Example 5: To c o n v e r t 45 degrees to r adians, g rads , and bac k to deg rees. F 4 45 A F 5 A F 6 A F 4 Repeated conversion between angle units can cause nor- m ...

  • Casio FX-280 - page 16

    — 14 — k Hyperbolic/Inverse Hyperbolic Functions • Example 1: sinh 3.6 3.6 M S • Example 2: sinh  1 30 30 M A j k Common and Natural Logarithms, Exponents • Example 1: log 1.23 1.23 R • Example 2: In 90 (  log e 90) 90 T • Example 3: 64 R 4 R = • Example 4: 10 0.4  5 e  3 .4 A Q + 5 - 3 E A U = • Example 5: 2 3 2 w 3 ...

  • Casio FX-280 - page 17

    — 15 — • Example 8: log sin 40° + log cos 35° (DEG mode) 40 S R + 35 W R = A Q • Example 9: 8 1/3 8 A s 3 = k Square Roots, Cube Roots, Squares, Reciprocals and Factorials • Example 1: 2  3  5 2 A L + 3 A L - 5 A L = • Example 2: 3 5  3  27 5 A D + 27 E A D = • Example 3: 123  30 2 123 + 30 K = • Example 4: 3 A X , ...

  • Casio FX-280 - page 18

    — 16 — • Example 5: 8! 8 A f k FIX, SCI, NORM, RND, RAN#, ENG Calculations • Example 1: 1.234  1.234, rounding result to two places (FIX 2). F 7 2 1.234 + 1.234 = • Example 2: 1.234  1.234, rounding input to tw o places. F 7 2 1.234 A b + 1.234 A b = •P r e ss F 9 to clear FIX specification. • Example 3: 1  3 , displa ying re ...

  • Casio FX-280 - page 19

    — 17 — • Example 4: To con ver t 56,088 meters to kilometers . 56088 A J • Example 5: To conv er t 0.08125 gr ams to millig r ams . .08125 A J • Example 6: To generate a random n umber between 0.000 and 0.999. Example (results diff er each time) A c k Coordinate Conversion • Example 1: To conv er t polar coordinates ( r  2,   6 ...

  • Casio FX-280 - page 20

    — 18 — θ A N k Permutation • Example: To deter mine how many diff erent 4-digit values can be produced using the numbers 1 through 7. 7 A m 4 = k Combination • Example: To determine how many diff erent 4-member gr oups can be organiz ed in a group of 10 individuals. 10 A n 4 = Statistical Calculations (SD Mode) •P ress F l to enter the S ...

  • Casio FX-280 - page 21

    — 19 — Input Data. A u 55 } 54 } 51 } 55 } 53 } } 54 } 52 } Sample standard de viatio n A q Population standard de viation A p Ar ithmetic mean A ` Number of data A r Sum of values A o Sum of squares of values A a • } } inputs the same data twice (as abov e). •Y ou can also input m ultiple entr ies of the same data using - . To input the da ...

  • Casio FX-280 - page 22

    — 20 — k Making Corrections During Data Input • Example 1: To change data y ou hav e just input. Correction Actual Correction 51 } 50 }A [ 51 } 130 - 31 } 130 - 31 } 120 - 120 - 31 t 130 - 31 } t 130 - 31 } 51 } 130 - 31 } 49 } 120 - 30 } 49 A [ 51 } 120 - 30 A [ 130 - 31 } Correct Actual Correct • Example 2: To change data you pre viously ...

  • Casio FX-280 - page 23

    — 21 — Te c hnical Information k Keys and Their Functions • General Arithmetic calculations .......................... + , , , - , ............. , = Backspace ............................................ Q Clear(retains memor y) .......................... k Number input ........................................ 0 – 9 , l Po we r on; A ll c ...

  • Casio FX-280 - page 24

    — 22 — 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 ....................... ...

  • Casio FX-280 - page 25

    — 23 — Cube ..................................................... A N Cube root .............................................. A D Engineering ........................................... A J , A P Fa ctor ial ................................................ A f Fr action ................................................. C Fr action ............ ...

  • Casio FX-280 - page 26

    — 24 — • Statistics (SD Mode) Arithmetic mean .................................... A ` Data delete ............................................ A [ Data input .............................................. } Number of data ..................................... A r Population standard deviation ............... A p Sample standard de viation .. ...

  • Casio FX-280 - page 27

    — 25 — To switc h between NORM 1 and NORM 2 Press F 9 . There is no indication on the display of which fo rm at is currently in eff ect, but you can determine the setting by perf or ming the following calculation. 1 200 = NORM 1 format NORM 2 f ormat •A ll of the e xamples in this manual show calculation results using the NORM 1 f or mat. k ...

  • Casio FX-280 - page 28

    — 26 — •I n a series of calculations, press k while an intermediate result is displayed to clear only the last calculation per- formed. •T o change the operator k ey ( + , , , - , , w , As , etc.) you just pressed, simply press the correct oper ator ke y . In this case, the operator of the last k ey y ou press is used, but the operation r ...

  • Casio FX-280 - page 29

    — 27 — •I n the case of condition e , you could also press k . T h i s clears the intermediate result just pr ior to the o verflo w, so you can continue with the calculation from that point. •N o error occurs when the result is within the range of  (1  10  99 )to  (1  10  99 ). Instead, the display shows all ze r o s . k P ...

  • Casio FX-280 - page 30

    — 28 — Important! Incorrect use of batteries can cause them to burst or leak, possib ly 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 th ...

  • Casio FX-280 - page 31

    — 29 — 5. Press t to turn power on. k Order of Operations and Levels Operations are performed in the following order of prec- edence. 1. Functions 2. x y , x 1/y , R → P, P → R, n P r , n C r 3.  ,  4.  ,  •O per ations with the same precedence are perf or med from left to right, with oper ations enclosed in parentheses per- f ...

  • Casio FX-280 - page 32

    — 30 — k Formulas, Ranges, and Conventions The following are the formulas, ranges, and conventions that are applied to various calculations that can be perf ormed using this calculator . Coor dinate T ransformation •W ith polar coordinates, θ can be calculated within a r ange of –180°  θ  180°. The calculation range is the same f ...

  • Casio FX-280 - page 33

    — 31 — n ! ( n  r )! n ! n !( n  r )! Per m u t ation •I nput r ange: n  r  0 ( n , r : integers) •F o r m u l a : n P r  Combination •I nput r ange: n  r  0 ( n , r : integers) •F o r m u l a : n C r  P opulation Standard De viation  n  n  i  1 n ( xi – x ) 2  n  x 2 – (  x ) 2 / n Sampl ...

  • Casio FX-280 - page 34

    — 32 — k Specifications Po wer Supply : fx-82SOLAR/fx-260SOLAR : Solar cell fx-85B/fx-280 : CASIO TW O-WA Y PO WER System: solar cell plus one G13 T ype (SR44 or LR44) batter y Batter y Life (fx-85B/fx-280) : Approximately 3 y ears (1 hour use per day) on LR44/SR44 batter y Input Ranges : tan –1 x sinh x cosh x tanh x sinh –1 x cosh –1 x ...

  • Casio FX-280 - page 35

    — 33 — Functions Input Range  x  1 1  10 –99  x  1  10 100 –1  10 100  x  100 –1  10 100  x  230.2585092 0  x  1  10 100  x  1  10 50  x  2.154434690  10 33  x  1  10 100 ; x ≠ 0  x  1  10 100 0  x  69 ( x is an integer) tanh –1 x log ...

  • Casio FX-280 - page 36

    — 34 — Functions Input Range x  0: –1  10 100  y log x  100 x  0: y  0 x  0: y  n ; ( n is an integer) Howe ver : –1  10 100  y log  x  100 To tal of integer, numer ator, and denominator must be 10 digits or less(including division marks). x  0: y ≠ 0 –1  10 100  1/ y log x  100 x  0 ...

  • Casio FX-280 - page 37

    — 35 — Operating T emperature: 0°C–40°C (32°F–104°F) Dimensions: fx-82SOLAR/fx-260SOLAR: 8(H)  66.5(W)  125(D) mm 5/16"(H)  2-5/8"(W)  4-15/16"(D) fx-85B/fx-280: 13.5(H)  73(W)  144.5(D) mm 1/2"(H)  2-7/8"(W)  5-5/8"(D) Wei ght: fx-82SOLAR/fx-260SOLAR: 47 g (1.7oz) fx-85B/fx-280: 67 ...

  • Casio FX-280 - page 38

    SA9709-C Printed in China Imprimé en Chine CASIO COMPUTER CO ., L TD . 6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan ...

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A complete manual for the device Casio FX-280, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Casio FX-280 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Casio FX-280.

A complete Casio manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Casio FX-280 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Casio FX-280, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Casio FX-280, that we can find in the current document
3. Tips how to use the basic functions of the device Casio FX-280 - which should help us in our first steps of using Casio FX-280
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Casio FX-280
5. FAQ - Frequently Asked Questions
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