HP 40gs Manual do Utilizador descarregar pdf (Página 258)

100

101

15-6 Equation Writer

this case, you have to press to select elements in the

expression.

The following illustration shows how an expression can

be viewed as a tree in the Equation Writer. It illustrates a

tree view of the expression:

Suppose that the cursor is positioned to the right of 3:

• If you press once, the 3 component is selected.

• If you press again, the selection moves up the

tree, with x + 3 now selected.

• If you press again, the selection moves up the

tree, and now the entire expression is selected.

• If you had pressed instead of when the

cursor was positioned to the right of 3, the leaves of

the branch get selected (that is, x + 3).

• If you press again, the selection moves up the

tree, and now the entire expression is selected.

• If you now press , just the numerator is selected.

• If you now press again, the top-most branch

selected (that is, (5x + 3).

• Continue pressing to select each top-most leaf in

turn (5x and then 5).

5x 3+()x 1–()⋅

x 3+

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