Question

（x的平方-xy分之y+y的平方-xy分之x)乘x-y分之xy

Answer 1

[(x²-xy)分之y +(y²-xy)分之x]*[(x-y)分之xy]
={[xy(x-y)]分之(y²-x²)}*[(x-y)分之xy]
=(y-x)分之(x+y)

Answer 2

（x的平方-xy分之y+y的平方-xy分之x)乘x-y分之xy
化简吗？
[(x²-xy)分之y +(y²-xy)分之x]*[(x-y)分之xy]
={[xy(x-y)]分之(y²-x²)}*[(x-y)分之xy]
=(y-x)分之(x+y)

希望能帮到你，祝你快乐！