EXERCICIOS:
Calcule o valor das expressões
a) 25-[10+(7-4)) =
b) 32+(10-(9-4)+8) =
c) 45-[12-4+(2+1)] =
d) 70-20-[10-(5-1)]) =
e) 28+(13-16-(4+1)+2)-1) =
1) 53-20-30-(15-1+6)+21) =
g) 62-16-17-(6-4)+11) =
h) 20-{8+[3+(8-5)-1]+6) =
0) 15+(25-12-(8-6))+2) =
1) 56-[3+(8-2)+(51-10)-(7-2)