Question

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Answer 1

Resposta:

2)

$x = \frac{5.3-15+8}{-3+7} \\\\x =\frac{15-15+8}{4} \\\\x = \frac{0+8}{4} \\\\x = \frac{8}{4} \\\\x = 2$

3)

a)

-5 . 4 = -20

b)

-7 . -6 = + 42

c)

12 . (-13) = -156

d)

-12 : (-4) = + 3

e)

-45 : 5 = - 9

Explicação passo-a-passo: