Question

sabendo f(x)=x/2 - 2/3 de determine o valor de f(1/2) + f(-2/3)

Answer 1

Resolução:
$f(x) = \frac{x}{2} - \frac{2}{3}$

$f( \frac{1}{2})= \frac{ \frac{1}{2} }{2} - \frac{2}{3}$

$f( \frac{1}{2})= \frac{1}{4} - \frac{2}{3}$

$f( \frac{1}{2})= \frac{3-8}{12}= \frac{-5}{12}$

$f( \frac{1}{2})= \frac{-5}{12}$

$f( \frac{-2}{3})= \frac{ \frac{-2}{3} }{2} - \frac{2}{3}$

$f( \frac{-2}{3})= \frac{-1}{3} - \frac{2}{3}= \frac{-1-2}{3}  [texf( \frac{-2}{3}) = \frac{-3}{3}=-1$

f(1/2) + f(-2/3)
-5/12 + (-1)
-5/12 - 1
(-5-12)/12
-17/12

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