Question

1) Calcule o valor das expressões:

a) – 65 – [– 20 + 5 – (– 15 + 5) + 40] =
b) 25 – {– 8 – [3 + (– 6 – 2) + 5]} =
c) 16 – (– 3) + [– 4 + 2 – (– 12 + 2)] =
d) (–3)3 . (– 2)2 + (– 3) + 50 =
e) (–1)3 +3+(+2).(+5)= f) (–2).(–7)+(–3)2 =

Answer 1

Explicação passo-a-passo:

$a) – 65 – [– 20 + 5 – (– 15 + 5) + 40] = \\ - 65 - 20 + 5( - 10) + 40 = \\ - 65 - 20 - 50 + 40 = \\ - 135 + 40 = \\ - 95$

$b) 25 –(– 8 – [3 + (– 6 – 2) + 5])= \\ 25 - ( - 8 - 3 + ( - 8) + 5) = \\ 25 - ( - 8 - 3 - 8 + 5) = \\ 25 - ( - 14) = \\ 25 + 14 = \\ 39$

$c) 16 – (– 3) + [– 4 + 2 – (– 12 + 2)] = \\ 16 + 3 + ( - 4 + 2 - ( - 10)) = \\ 16 + 3 + ( - 2 + 10) = \\ 16 + 3 + (8) = \\ 27$

$d) (–3)3 \times (– 2)2 + (– 3) + 50 = \\ - 3 \times 3 \times - 2 \times 2 - 3 + 50 = \\ - 9 \times - 4 - 3 + 50 = \\ 36 - 3 + 50 = \\ 83$

$e) (–1)3 +3+(+2) \times (+5)= \\ - 1 \times 3 + 3 + 2 \times 5 = \\ - 3 + 3 + 10 = \\ 10$

$f) (–2) \times (–7)+(–3)2 = \\ - 2 \times - 7 - 3 \times 2 = \\ 14 - 6 = \\ 8$