计算(xy-y^2)/[(x-1)/(xy)]
问题描述：
计算(xy-y^2)/[(x-1)/(xy)]
七下数作（1）第42页
答
(xy-y^2)/[(x-1)/(xy)](xy-y^2)/[(x-1)/(xy)]＝(xy-y^2)*[(xy)/(x-1)]＝y(x-y)*[(xy)/(x-1)]＝xy^2(x-y)/(x-1)式中的x-1会不会是x-y?如果是的话结果就简单了：(xy-y^2)/[(x-y)/(xy)]＝(xy-y^2)*[(xy)/(x-y)]＝y(x-y)...