HP 40gs Manual do Utilizador descarregar pdf (Página 285)

100

101

Step-by-Step Examples 16-11

Now consider the product of two of the definitions

entered above: B(N) × C(N):

B N

N .

Press ,

to select EXP2POW and

press .

Press to evaluate

the expression, yielding the

result of B(N) × C(N).

Consider now the decomposition of A(6) into its prime

factors.

Press ,

to select FACTOR and press

Now press A 6.

Finally, press to get

the result. The factors are

listed, separated by a

medial period. In this case,

the factors are 3, 23, 29

and 1999.

Now let’s consider whether b

and c

are relatively prime.

Here, the calculator is useful only for trying out different

values of n.

To show that b

and c

are relatively prime, it is enough

to note that:

That means that the common divisors of b

and c

are the

common divisors of b

and 2, as well as the common

divisors of c

and 2. b

and 2 are relatively prime

because b

is a prime number other than 2. So:

2+=

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