HP 48gII Manual do Utilizador descarregar pdf (Página 37)

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This expression is semi-symbolic in the sense that there are floating-point

components to the result, as well as a √3. Next, we switch stack locations

and evaluate using function

NUM:

™…ï

This latter result is purely numerical, so that the two results in the stack,

although representing the same expression, seem different. To verify that they

are not, we subtract the two values and evaluate this difference using function

EVAL: -µ. The result is zero (0.).

For additional information on editing arithmetic expressions in the display or

stack, see Chapter 2 in the calculator’s user's guide.

Creating algebraic expressions

Algebraic expressions include not only numbers, but also variable names. As

an example, we will enter the following algebraic expression:

We set the calculator operating mode to Algebraic, the CAS to Exact, and the

display to Textbook. To enter this algebraic expression we use the following

keystrokes:

2*~l*R„Ü1+~„x/~r™/„

Ü ~r+~„y™+2*~l/~„b

Press

to get the following result:

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 174 175

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HP 48gII Manual do Utilizador Página 37