Question

Elimine os parênteses e calcule:
a) (+20) + (−15) + (−10) =
b) (+16) + (−21) + (+15) =
c) (+11) + (+17) + (−27) =

d) (−10) + (−4) + (+9) =
e) 20 − (−4) − (+16) =
f) −(−9) + (−6) − (+7)

Answer 1

a) (+20) + (−15) + (−10)= 20 -15 -10= 5 -10= -5

b) (+16) + (−21) + (+15)= 16 -21 +15= -5 +15= 10

c) (+11) + (+17) + (−27)= 11 +17 -27= 28 -27= 1

d) (−10) + (−4) + (+9)= -10 -4 +9= -14 +9= -5

e) 20 − (−4) − (+16)= 20 +4 -16= 24 -16= 8

f) −(−9) + (−6) − (+7)= 9 -6 -7= 3 -7= -4