(x2-2xy+y2)-(x2+2xy+y2)=什么
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(x2-2xy+y2)-(x2+2xy+y2)=什么(x2-2xy+y2)-(x2+2xy+y2)=什么(x2-2xy+y2)-(x2+2xy+y2)=什么-4xy-4xy(x2-2xy+y2)-(x
(x2-2xy+y2)-(x2+2xy+y2)=什么
(x2-2xy+y2)-(x2+2xy+y2)=什么
(x2-2xy+y2)-(x2+2xy+y2)=什么
-4xy
-4xy
(x2-2xy+y2)-(x2+2xy+y2)
=x2-2xy+y2-x2-2xy-y2)
=-4xy
(X-y)2-(x+y)2=(x-y-x-y)(x-y+x+y)=-2y.2x=-4xy
计算：(xy-x2)÷xy分之x2-2xy+y2
(x2+2xy+y2)( x2-xy+y2)2 化简
(x2-2xy+y2)-(x2+2xy+y2)=什么
( x2+xy+y2) ( x2+xy+2y2)-12y4
x2-2xy+y2-9
2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)] 化简.
求证:(x2-xy+y2)3+(x2+xy+y2)3能被2x2+2y2整除
若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=?
4x2-3y2+2xy-4x2+5x2
(x2+y2)(x2-xy+y2)-2x2y2因式分解
2(x-xy)-3(2x2-3xy）2[x2（2x2-xy+y2)]
4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy
已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2=
x2+y2+2xy=256 x2+y2-2xy=4 (x2,
已知x2-3xy=-5,xy+y2=3,求x2-2xy+y2.
(3xy-9x2-2y2-6xy)-(6x2+2xy-3xy-y)
(x2+xy+y2)-4xy(x2+y2)
-（x2-2xy-y2)+(5x2-2xy-3y2)-（x2-2xy-y2)+(5x2-2xy-3y2)化简