Respuesta:
a) [(-28) +42]-13= 14-13=1
b)[(-15)+6]-23= (-9)-23= -32
c)[45+4]-17= 49-17= 32
d)[17+18]+72= 35+72= 107
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Respuesta:
a) [(-28) +42]-13= 14-13=1
b)[(-15)+6]-23= (-9)-23= -32
c)[45+4]-17= 49-17= 32
d)[17+18]+72= 35+72= 107