Question

Valor da expressão : A) -1000+100-10+1
B) -2-(-2)-4-(-4)

C) (-5-2)+(-5+2)+(5-2)

D) -(35-40)-{5-[10+(-7-8)]}

E) -(-a)-(+b)-(-c)+(-d)

Answer 1

A) -1000+100-10+1 ==> - 1010 + 101==> - 909

B) -2-(-2)-4-(-4) = - 2 + 2 - 4 + 4 ==> 0

C) (-5-2)+(-5+2)+(5-2) = - 7 - 3 + 3 ==> - 7 

D) -(35-40)-{5-[10+(-7-8)]} = + 5 - {5-[10-15]} ==> + 5 - {5+5} ==>5-10 ==> - 5

E) -(-a)-(+b)-(-c)+(-d) = + a - b + c - d