Question

4) Resolva as expressões abaixo:
a) (18 – 15 + 3) + 2 = 8
b) (30 – 6) – 3×(5 + 10) – 7 =
c) 5² + 2³ - 2 × (3 + 9) =

Answer 1

Resposta:

a) (18 – 15 + 3) + 2 = 8

$18 - 15 + 3 + 2 - 8 \\18 - 12 - 6 \\ 18 - 18 \\ = 0$

b) (30 – 6) – 3×(5 + 10) – 7 =

$30 - 6 - 3 \times 15 - 7 \\ 30 - 6 - 45 - 7 \\ 24 - 52 \\ = - 28$

c) 5² + 2³ - 2 × (3 + 9) =

$25 + 8 - 2 \times 12 \\ 25 + 8 - 24 \\ 33 - 24 \\ = 9$