5/8*33+66*62.5%+0.652
=0.625×33+66×0.625+0.652
=0.625×33(1+2)+0.652
=0.625×99+0.652
=0.625(100-1)+0.652
=62.5-0.625+0.652
=62.527
你的题目里的0.652应该是0.625吧?是5/8*33+66*62.5%+0.625=0.625×33+66×0.625+0.625=0.625×(33+66+1)=0.625×100=62.5