Question

Elimine os parênteses e calcule. a) 5-6-(+7)+1 b) -28+7+(+12)+(-1)-6 c)-21-7-6-(-15)-2-(-10)

Answer 1

a) 5-6-7+1= -7
b) -28+7+12-1-6= -16
c) -21-7-6+15-2= -36+25= -11

Answer 2

a) 5 - 6 -  7 + 1 = - 17
b) -28 + 7 + 12 - 1 - 6 = - 16
c) -21 - 7 - 6 + 15 - 2 + 10 = - 11