Question

Calcule o valor das expressões: a) (– 49) : (+7) – (– 20) c) (+5) . (–6) – (+3) . (–10) b) (– 7) . (+10) + (–35) : (–7) d) 90 : (–3) + (+ 2) . (–9)

Answer 1

→ Cálculo :

A) ( - 49 ) : ( + 7 ) - ( - 20 )

- 7 - ( - 20 )

- 7 + 20

13

B) ( - 7) · ( + 10) + ( - 35 ) ÷ ( -7 )

- 70 + ( - 35 ) ÷ ( - 7 )

- 70 + 5

-65

C) ( +5 ) · ( - 6 ) - ( + 3 ) · ( - 10 )

- 30 - ( - 30 )

- 30 + 30

0

D) 90 ÷ ( - 3 ) + ( + 2 ) · ( - 9 )

- 30 + ( - 18 )

- 30 - 18

-48