a) -30-5·[(-1)·(15-3·6)+9-3·4]
-30-5[(-1)·(15-18)+9-12]
-30-5·[(-1)·(-3)+9-12]
-30-5·[3+9-12]
-30-5·0
-30
b) -5+[(-20)·(-15+30)·(-1)]
-5+[(-20)·15·(-1)]
-5+300
295
c) 18+4·[-6-4·(-5+6)]
18+4·[-6-4·1]
18+4·(-10)
18-40
-22
d) 2-3·[1-(2-8+4·2)-5]
2-3·[1-(2-8+8)-5]
2-3·[1-2-5]
2-3·(-6)
2+18
20
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Lista de comentários
a) -30-5·[(-1)·(15-3·6)+9-3·4]
-30-5[(-1)·(15-18)+9-12]
-30-5·[(-1)·(-3)+9-12]
-30-5·[3+9-12]
-30-5·0
-30
b) -5+[(-20)·(-15+30)·(-1)]
-5+[(-20)·15·(-1)]
-5+300
295
c) 18+4·[-6-4·(-5+6)]
18+4·[-6-4·1]
18+4·(-10)
18-40
-22
d) 2-3·[1-(2-8+4·2)-5]
2-3·[1-(2-8+8)-5]
2-3·[1-2-5]
2-3·(-6)
2+18
20