Question

elimine os parenteses e calcule
a) ( + 3) + ( - 4) - ( + 9 ) + (2) - (-7)=
b) - ( + 2,8) - ( - 3,9 ) + ( + 1,5 ) =
c) - ( - 4 ) - ( - 6 ) + ( - 6 ) - ( + 15 ) =
d) - ( - 8 ) - ( + 3 ) + ( - 3 ) - ( - 4 ) + 2 =
e) + 28 _ ( - 15 ) - ( + 23 ) + ( - 32 ) =

Answer 1

a) -1

b)2,6

c)-11

d)8

e)-12