11- Resolva as expressões:
a)
12 +18 - 13 - 15 + 10 =
b)
16+ [25 - (10 + 12) - 9] =
c)
[(21 +3 · 2) = 9+5 · 3] + 6 =
d)
57 + [-35 - (-11 + 9 – 4)] =
60 = {2 [-7 + 18 = (-3 + 12)]} -
f)
-8 + {-5+ [(8 - 15) + (10+12)]​