Resposta:
Explicação passo-a-passo:
2/3 + [3/5 .(2/3-1/2)]=
2/3 + [3/5 . (4/6-3/6)]=
2/3 + [3/5 .1/6]=
2/3 + [3/30]=
20/30+3/30
23/30
resposta B
