Question

1.resolva as expressões

a) 5+(2-6)=

b)-15-(-23+12)=

c) (9-15)+(12-20)=

d) 20-{-10-[-8+(5-12)]-20}=

e) (-2)+(-3)-{-21+[-1-(-2+1)]+5}=

Answer 1

(a) 5+(2-6) = 5+4 = 9
(b) -15-(-23+12) = -15 - (-11) = -15+11 =-4
(c) (9-15) +(12-20) = -6 +(-8) = - 6 - 8 = -14
(d) 20 - {-10 - [-8+(5-12)] - 20} = 20 - {-10 - [ - 8 - 7] - 20} = 20 - {-10+15-20} = 20 +15 = 35 (e) (-2)+(-3)-{-21+[-1-(-2+1)]+5}= 11

Answer 2

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