350*7/(5+7)=1225/6乙为1225/6
设甲为5X,则乙为7X有5X+7X=350 12X=350X=175/6乙为7X=7*175/6=1225/6没这么复杂吧,还是你题上数字给错了?
晕又来一题350*7/(5+7)约等于204