解:35/38×11原式=(1-3/38)×11=11-33/38=385/38=10.131578947368 15-4/5×2/3-7/15原式=15-(8/15+7/15)=15-1=14
(1-3/35)*11=11-33/35=10又2/35
(1-3/35)*11=(1*11)-(3/5*11)=11-33/35=10又2/35