Question

1 - Calcule as expressões númericas.
a) (-2)×(-3)+(-1+5)
b) (-8)×(+4-2)-(-12)×(-5+7)
c) (-5+7)-(-12+9)-[-(-4)×(-5+4)]
d) -{-12-(-8)-[-2+5×(-3+9)]}
e) {12-(-5+9)-[+5-(-2+13)]-(-5+3)}

Answer 1

Resposta:

b) (-8)×(+4-2)-(-12)×(-5-7)

-8×2--12×2

-16+24

=8