Question

Efetue as somas algebricas: a) {57-[108-(71+26)]} + {100-[65+(51-16)]} -40
b) 40- {15+[8+(2-7+8)-20]+1} -20

Answer 1

a)
= {57-[108-(71+26)]} + {100-[65+(51-16)]} -40
= {57-[108-97]}+{100-[65+35]} - 40
= {57 - 11} + {100 - 100} - 40
= 46 + 0 - 40
= 6

b)
= 40- {15+[8+(2-7+8)-20]+1} -20
= 40-{15+[8+3-20] +1} - 20
= 40-{15+[11-20] +1} - 20
= 40-{15 - 9 + 2} - 20
= 40 - 8 - 20
= 40 - 28
= 12