1)resolva as expressões a seguir
a) -68+{44+[29-(40-31+9)]}
b) -100+(97-[-(-28-37)+(-17-9)])
a) -68+{44+[29-(40-31+9)]}
b) -100+(97-[-(-28-37)+(-17-9)])
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-68+{44+[29-(40-31+9)]}
-68+{44+[29-(9+9]}
-68+{44+[29-18]}
-68+{44+[29+18]}
-68+{44+11}
-68+55=
-13
-100+(97-39)
-100+58
-42