Question

08- Calcule o resultado da expressão

( -4/9) . (+5/2) +(-4/6) : (-3/4)

a) -1/18

b) 2/18

C) - 4/18

d) - 6/18




9 - O valor de (1/2)², ( 1/3)² e (1/6)² respectivos é:

a) 1/4, 1/6 e 1/12

b) 1/4, 1/9 e 1/36

c) 2/4, 2/6 e 2/12

d) 4, 9 e 12

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Answer 1

Explicação passo-a-passo:

1)

$\sf \Big(-\dfrac{4}{9}\Big)\cdot\Big(+\dfrac{5}{2}\Big)+\Big(-\dfrac{4}{6}\Big)\div\Big(-\dfrac{3}{4}\Big)$

$\sf =\dfrac{(-4)\cdot5}{9\cdot2}+\Big(-\dfrac{4}{6}\Big)\cdot\Big(-\dfrac{4}{3}\Big)$

$\sf =\dfrac{-20}{18}+\dfrac{16}{18}$

$\sf =\dfrac{-20+16}{18}$

$\sf =\red{\dfrac{-4}{18}}$

Letra C

2)

=> (1/2)²

$\sf \Big(\dfrac{1}{2}\Big)^2=\dfrac{1^2}{2^2}$

$\sf \red{\Big(\dfrac{1}{2}\Big)^2=\dfrac{1}{4}}$

=> (1/3)²

$\sf \Big(\dfrac{1}{3}\Big)^2=\dfrac{1^2}{3^2}$

$\sf \red{\Big(\dfrac{1}{3}\Big)^2=\dfrac{1}{9}}$

=> (1/6)²

$\sf \Big(\dfrac{1}{6}\Big)^2=\dfrac{1^2}{6^2}$

$\sf \red{\Big(\dfrac{1}{6}\Big)^2=\dfrac{1}{36}}$

Letra B