Question

Calcule o valor de N, quando:
a) N=2.(+7)+5.(-2).
b) N=(-6).(-3)+2.(-6)
c) N=3.(+8)-7.(-7)
d) N=2.(+10)+5.(-2)-10

Answer 1

Resposta:

$a)n = 2 \times ( + 7) + 5 \times ( - 2) \\ n = 14 + ( - 10) \\ n = 4$

$b)n = ( - 6) \times ( - 3) + 2 \times ( - 6) \\ n = 18 - 12 \\ n = 6$

$c)n = 3 \times ( + 8) - 7 \times ( - 7) \\ n = 24 + 49 \\ n = 73$

$d)n = 2 \times ( + 10) + 5 \times ( - 2) - 10 \\n = 20 - 10 - 10 \\ n = 20 - 20 \\ n = 0$