User manual CASIO FX-82D

[. . . ] · Never charge batteries, try to take batteries apart, or allow batteries to become shorted. Never expose batteries to direct heat or dispose of them by incineration. · Misuse of batteries can cause them to leak acid that can cause damage to nearby items and creates the possibility of fire and personal injury. · Always make sure that a battery's positive k and negative l sides are facing correctly when you load it into the calculator. [. . . ] · Press [ to delete the number or function at the current cursor position. Inputting something while the insert cursor is on the display inserts the input at the insert cursor position. · Press e, r, A K, or = returns to the normal cursor from the insert cursor. k Replay Function · Pressing r or e recalls the last calculation you performed. You can then make any changes you want in the calculation and re-execute it. · Pressing t does not clear Replay memory, so you can recall the last calculation even after you press t. · Replay memory is cleared whenever you start a new calculation, change to another mode, or turn off power. k Error Locator · Pressing r or e after an error occurs displays the calculation with the cursor positioned at the location where the error occurred. E-9 k Exponential Display Formats This calculator can display up to 10 digits. In the case of decimal values, you can select between two formats that determine at what point exponential notation is used. For other models, press F F F 3 1 (or 2). · 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. · All of the examples in this manual show calculation results using the NORM 1 format. k Answer Memory · Whenever you press = after inputting values or an expression, the calculated result is automatically stored in Answer Memory. · Answer Memory can store up to 12 digits for the mantissa and two digits for the exponent. · Answer Memory contents are not changed if the operation performed by any of the above key operations results in an error. E-10 Basic Calculations · Use the COMP mode for basic calculations. Next, use the regression formula to estimate atmospheric pressure at 18°C and temperature at 1000 hPa. Enter REG Mode (Linear Regression) fx-85W: q q 2 1 Other models: q 3 1 A m = (Memory Clear) 10 P 1003 S 15 P 1005 S 20 P 1010 S 25 P 1011 S 30 P 1014 S (Regression Coefficient A) (Regression Coefficient B) (Correlation Coefficient r) (Atmospheric Pressure at 18°C) (Temperature at 1000 hPa) 30. 00 REG Aq= Aw= AJ= 18 A b 1000 A O 997. 400 0. 5600 0. 98260736800 1007. 4800 4. 64285714300 · Quadratic Regression · The regression formula for quadratic regression is: y = A + Bx +Cx2. <x-data> P <y-data> S E-21 · Example: xi 29 50 74 103 118 yi 1. 6 23. 5 38. 0 46. 4 48. 0 Perform quadratic regression to determine the regression formula terms and correlation coefficient for the data nearby. Next, use the regression fory mula to estimate the values for ^ (esx timated value of y) for xi = 16 and ^ (estimated value of x) for yi = 20. Enter REG mode (Quadratic regression) fx-85W: F F 2 r 3 Other models: q 3 r 3 Am= 29 P 1. 6 S 50 P 23. 5 S 74 P 38. 0 S103 P 46. 4 S 118 P 48. 0 S (Regression Coefficient A) (Regression Coefficient B) (Regression Coefficient C) (^ when xi = 16) y (^ 1 when yi = 20) x (^ 2 when yi = 20) x 118. REG A q = -35. 59856934 Aw= 1. 495939413 A e = -6. 71629667-03 16 A b -13. 38291067 20 A O 47. 14556728 175. 5872105 AO Data Input Precautions · S S inputs the same data twice. · You can also input multiple entries of the same data using A G. To input the data "20 and 30" five times, for example, press 20 P 30 A G 5 S. · The above results can be obtained in any order, and not necessarily that shown above. · To delete data you have just input, press A U. E-22 Formula Memory (fx-85W) · Formula memory lets you input a single formula in memory, and then input values for the formula's variables to calculate results. · Note that the formula is actually stored in memory when you press the C key in the sequence below. · Example: To save the following formula, recall it, and then use it to calculate a result: Y = X2 + 3X ­ 12 Input the formula. p yp u px K+ 3 p x , 12 Store it in memory. Input a value for its variable. Y= X 2 +3 X-12 0. X? C 7= 0. 58. X? = 8= 7. 76. · Formula memory is cleared whenever you start a new calculation, change to another mode, or turn off power. Base-n Calculations (fx-85W) · In addition to decimal values, calculations can be performed using binary, octal and hexadecimal values. · You can specify the default number system to be applied to all input and displayed values, and the number system for individual values you input. [. . . ] E-26 Arg ERROR · Cause · Improper use of argument · Action · Press e or r to display the location of the cause of the error and make required corrections. k Order of Operations Calculations are performed in the following order of precedence. 1 Coordinate transformation: Pol (x, y), Rec (r, ) 2 Type A functions: With these functions, the value is entered and then the function key is pressed. x2, x 1, x!, ° ' " 3 Powers and roots: xy, x 4 a b/c 5 Abbreviated multiplication format in front of , memory name, or variable name: 2, 5A, A etc. 6 Type B functions: With these functions, the function key is pressed and then the value is entered. [. . . ]