Efetue as adiçoes a seguir e,antes,se necessario simplifique-as : a] 150+70= b] -160+70= c]190+[- 60] = d] - 80+[-80]= e] - 60+80+[-60] +[-190]+60= f]-150-70= g]-160 +[-80]= h]-60+190= i] -190+190
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