Casio FX-991ES User Guide - Page 30
Using CALC - features
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Using CALC The CALC feature lets you input a calculation expression that contains variables, and then assign values to the variables and perform the calculation. You can use CALC in the COMP Mode (N1) and in the CMPLX Mode (N2). k Expressions Supported by CALC The following describes the types of expressions that can be used with CALC. u Expressions that contain variables Example: 2X + 3Y, 5B + 3i, 2AX + 3BY + C u Multi-statements Example: X + Y : X (X + Y) u Expressions with a single variable on the left Example: {variable} = {expression} The expression on the right of the equals sign (input using Ss(=)) can contain variables. Example: Y = 2X, A = X2 + X + 3 k Example Calculation Using CALC To start a CALC operation after inputting an expression, press the s key. Example: LINE 3*Sy(A) s Prompts for input of a value for A. Current value of A 5= E-28