HP 40gs Manual do Utilizador descarregar pdf (Página 260)

100

101

15-8 Equation Writer

(– X) apply to it. As a result, the entered expression is

interpreted, and displayed, as (2 + X)(3 – X).

Select the entire expression

by pressing and

evaluate it by pressing

. The result is:

–(X

–X–6)

Example2

To enter X

–3X+1, press:

2 – 3

If, instead, you had to enter

–x

–3X+1, you would need

to press:

(–) 2 – 3 +1

Note that you press twice to ensure that the exponent

applies to –X and not just to X.

Example 3

Suppose you want to enter:

Each fraction can be viewed

as a separate branch on the

equation tree. In the

Equation Writer type the first

branch:

1 ÷ 2

and then select this branch by pressing .

Now type + and enter the second branch:

1 ÷ 3

Select the second branch by pressing .

Now type + and enter the third branch:

1 ÷ 4

Likewise, select the third branch by pressing , type +

and then the fourth branch:

1 ÷ 5

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