Question

Calcule o valor das expressoes
A) - {15-[(-4+20)-20]-17}
B) 3.(-4)+(-5).(-6).(-2)+(-4).(-7)

Answer 1

A) -(15-((-4+20)-20)-17
-(15-(16-20)-17
-(15-(-4)-17
-(15+4-17)
-2

B) 3×(-4)+(-5)×(-6)×(-2)+(-4)×(-7)
-12+(-5)×(-6)×(-2)+4×(-7)
-12-60+4×(-7)
-12-60-28
-100