HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 259
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hp40g+.book Page 7 Friday, December 9, 2005 1:03 AM More Examples Equation Writer • Press again and again to progressively select more of the top-most branch, and then lower branches (5x, 5x + 3, and then the entire numerator and finally the entire expression). Example1 If you enter: 2 + X × 3- X and press the entire expression is selected. Pressing evaluates what is selected (that is, the entire expression) and returns: 2X + 2 If you enter the same expression as earlier but press after the first X, as in: 2+X ×3-X the 2 + X is selected and the next operation, multiplication, is applied to to it. The expression becomes: (2 + X) × 3 - X Pressing selects the entire expression, and pressing evaluates it, resulting in: 2X + 6 Now enter the same expression, but press 3, as in: after the 2+X ×3 -X Note that selects the expression so far entered (2 + X) thus making the next operation apply to the entire selection, not just the last entered term. The key selects just the last entry (3) and makes the next operation 15-7