百度作业网[（X²-7XY+10Y²）/（X²+4XY-12Y²）]×[（X²+
![[（X²-7XY+10Y²）/（X²+4XY-12Y²）]×[（X²+](/uploads/image/z/5442856-16-6.jpg?t=%5B%EF%BC%88X%26%23178%3B-7XY%2B10Y%26%23178%3B%EF%BC%89%2F%EF%BC%88X%26%23178%3B%2B4XY-12Y%26%23178%3B%EF%BC%89%5D%C3%97%5B%EF%BC%88X%26%23178%3B%2B)
x-y/x²÷x²-2xy+y²/xy*（xy-x²）
[（X²-7XY+10Y²）/（X²+4XY-12Y²）]×[（X²+
计算：(xy-x²)×x-y/xy
x²/xy-x/y
计算：（xy-x²）乘 x-y分之xy
3x²y+xy²-[2xy²-4x²y+（x²y-2xy²）
分式（x²-y²\xy）-（xy-y²\xy-x²）可化简为
已知有理数x,y满足xy=4,x+y=7,则x²y+xy²=（）?
(xy-x²）²÷（x-y)²/xy·x-y/x² 计算
(x+y)(x²-xy+y²）—xy（x+y）因式分解
计算 2xy[4x²y²-3y（xy+x²y）-xy²]
已知x²+y²-8x+6y+25=0,求（x-y+4xy/x-y）（x+y-4xy/x+y）