Question

Calcule eliminando os parênteses:

-5-(-2+3-1)


(-8)+(-6)-(-7)

Answer 1

a) - 5 + 2 - 3 + 1           -> -(-2) = +2       -> -(+3) = -3     -> -(-1) = +1

-8 + 3 = -5

b) -8 - 6 + 7                  -> +(-8) = -8       -> +(-6) = -6     -> -(-7) = 7

-14 + 7 = -7