Question

Elimine os parênteses e calcule a) 30-(6-1+7)= b) 4+(3-5)+(-2-6)= c) 4+(-5+0+8-4)= d) 8-(3+5-20)+(3-10)=

Answer 1

a) 30 - (6-1 + 7) = 30 - ( 12) = 30 - 12 = 8
b) 4 + (3-5) + (-2-6) = 4 + (-2) + (-8) = +4 -2 -8 = -6
c) 4 + (-5+0+8-4) = 4 + (-1) = 4 - 1 = 3
d) (3 + 5 -20) + (3-10) = -12 -7 = -19