Casio CFX-9800G-w Owners Manual - Page 90
Ecimmmei
UPC - 079767128685
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The following are the operations that are available from the function menu at the bottom of the display. Press the function key below the operation you want to perform. E(2) g(3) gm D(5) D(6) Linear equation with two unknowns Linear equation with three unknowns , Linear equation with four unknowns Linear equation with five unknowns Linear equation with six unknowns IIISolving a Linear Equation with Three Unknowns Example To solve the following linear equation's for x, y, and z: 4x+y- 2z= - 1 x+ 6y+ 3z=1• - 5x+4y+z= -7 While in the Linear Equation Mode (SIM), press E (3), because the linear equations being solved have three unknowns. . . an X+bn Y+cn Z=dn Coefficient input cells Value being input into highlighted cell. 2 fi a fi 0 II 0YILICRWO Input each coefficient. ECIMMMEI MEEILIITILIECLI BECIMEILIO EIECI an X+bn Y-I-CnZ=Cin ir I -2 -I 1 -7 54L GLR[~ -144- Each time you press g, the input value is registered in the highlighted cell. Each press of g inputs values in the following sequence: coefficient at -) coefficient b,-) coefficient di -) coefficient n -) coefficient ti3 -) coefficient cz-0 coefficient a3 coefficient 63 -) coefficient c3 *You can input fractions and value memory contents as coefficients. After inputting the coefficients, solve the equations. ERSOL) anX+bn Y+cnZ=dn HT71 Highlighted solution cell value 1 *Internal calculations are performed using a 15-digit mantissa, but results are displayed using a 10-digit mantissa and 2-digit exponent. •This unit performs simultaneouslinearequation3 by placing the coefficients inside of a matrix. Because of this,.as the coefficient matrix approaches zero, precision in the inverse matrix- is reduded and so precision in the results produced also deteriorates. For example, the solution for a linear equation with three unknowns would be calculated as shownbelow. x a, b, y = a, 112/ • a3 ba • - 1 [ d, d, •An "Ma ERROR" occurs whenever the un't is unable to solve the equations. *Pressing E (RPT) returns to the initial display of the Linear Equation Mode. Depending_on the coefficients that you use, it may take considerable time for the calculation result of simultaneous linear equations to appear on the display. Failure of a result to appear immediately does not mean that the unit is not functioning properly. MChanging Coefficients You can change a coefficient either before or after you register it by pressing g. • To change a coefficient before registering it with C) Press them key to clear the current value and then input another one. • To change a coefficient after registering it with Use the cursor keys to highlight the cell that contains the coefficient that you want to change. Next, input the value that you want to change to. -145-