作业帮XY（XY-X2)乘以------------X-Y
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XY（XY-X2)乘以------------X-Y
XY
（XY-X2)乘以------------
X-Y
XY（XY-X2)乘以------------X-Y
XY(XY-X^2)(X-Y)=X^2Y(X-Y)(X-Y)=(X-Y)(X^2Y-1)
XY（XY-X2)乘以------------X-Y
(x2次方+xy-y2次方）乘以（x2次方+xy+y2次方）
(x2+xy+y2)-4xy(x2+y2)
计算：(xy-x2)÷xy分之x2-2xy+y2
当x=2时,y=2008,代数式x2+2xy+y2/x2+y2乘以x-y/x2+xy的值= x2为x的平方
2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)] 化简.
(3xy-9x2-2y2-6xy)-(6x2+2xy-3xy-y)
题如下、 已知2x+y=0,求x2+xy分之x-2y乘以(x2-y2)除以x分之x2-4xy+4y2的值.求（X2+XY）分之（X-2Y）乘以（X2-Y2）除以（X）分之（X2-4XY+4Y2）的值
xy
(x2+2xy+y2)( x2-xy+y2)2 化简
(x2-2xy+y2)-(x2+2xy+y2)=什么
( x2+xy+y2) ( x2+xy+2y2)-12y4
(x2+xy+y2)-4xy(x2+y2)因式分解
因式分解x2+y-xy-x
因式分解x2+xy-3y2
因式分解x3+x2+xy-xy2
(x-y)(x2+xy+y2)
(x+y)(x2-xy+y2)