HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 341
Examples using the CAS, Example 1: Simplifying a fraction with working
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Examples using the CAS In these examples we will begin with exercises which demonstrate the basic abilities of the CAS to simplify expressions and then move on to the use of the functions available through the various menus. In the initial examples the exact keystrokes will be supplied but in later ones this may not always be the case. Example 1: Simplifying a fraction with working Suppose you are required to simplify the expression shown right, giving your answer as a proper fraction. i. Begin by entering the top pair of fractions: 3 4 SHIFT SHIFT 1 2 3 12 13 At this point the screen should appear as shown above right. ii. We will now simplify selectively in order to be able to record working, beginning with the denominator: ENTER 3−2 43 1− 12 13 iii. Because the entire denominator is selected, pressing will now select the numerator. To evaluate this, press ENTER again: iv. Now press SHIFT to select the entire expression and then ENTER to evaluate it: v. To obtain a mixed fraction we use the function PROPFRAC, designed to transform improper fractions to mixed. The fraction is already selected, so choosing the fraction now will apply it: SHIFT CMDS 7 ENTER ENTER Note: The 7 above causes a jump to the first function beginning with a P, the letter on the 7. The arrows within any menu cause a page down. The alternative is just to scroll to the function. 341
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