( x2+xy+y2) ( x2+xy+2y2)-12y4
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(x2+xy+y2)(x2+xy+2y2)-12y4(x2+xy+y2)(x2+xy+2y2)-12y4(x2+xy+y2)(x2+xy+2y2)-12y4=(x²+xy+y²)(
( x2+xy+y2) ( x2+xy+2y2)-12y4
( x2+xy+y2) ( x2+xy+2y2)-12y4
( x2+xy+y2) ( x2+xy+2y2)-12y4
=(x²+xy+y²)(x²+xy+y²+y²)-12y的4次方
=(x²+xy+y²)²+y²(x²+xy+y²)-12y的4次方
=(x²+xy+y²+4y²)(x²+xy+y²-3y²)
=(x²+xy+5y²)(x²+xy-2y²)
=(x²+xy+5y²)(x+2y)(x-y)
(x2+xy+y2)-4xy(x2+y2)
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+xy+y2)-4xy(x2+y2)因式分解
因式分解x2+xy-3y2
(x-y)(x2+xy+y2)
(x+y)(x2-xy+y2)
X2+3xy+y2因式分解
x2-2xy+y2-9
2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)] 化简.
x2-y2=xy,xy不等于0求x2/y2=y2/x2
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
分式分解：4y2-x2/-x2-4y2+4xy