Question

Determine o valor numérico das expressões, para x = -1,1 e y=0,5.
a) (x + y). (x - y)

b)x+y
x-y
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Answer 1

Explicação passo-a-passo:

a) $\sf (x+y)\cdot(x-y)=(-1,1+0,5)\cdot(-1,1-0,5)$

$\sf (x+y)\cdot(x-y)=-0,6\cdot(-1,6)$

$\sf (x+y)\cdot(x-y)=0,96$

b) $\sf \dfrac{x+y}{x-y}=\dfrac{-1,1+0,5}{-1,1-0,5}$

$\sf \dfrac{x+y}{x-y}=\dfrac{-0,6}{-1,6}$

$\sf \dfrac{x+y}{x-y}=\dfrac{6}{16}$

$\sf \dfrac{x+y}{x-y}=\dfrac{3}{8}$

$\sf \dfrac{x+y}{x-y}=0,375$