x2一2xy十y2一9
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x2一2xy十y2一9x2一2xy十y2一9x2一2xy十y2一9(x－y)²－9=(x-y)2-9=(x-y+3)(x-y-3)因式分解=(x-y)2-9＝（x－y）2－3^2=(x-y+
x2一2xy十y2一9
x2一2xy十y2一9
x2一2xy十y2一9
(x－y)²－9
=(x-y)2-9
=(x-y+3)(x-y-3)
因式分解=(x-y)2-9
＝（x－y）2－3^2=(x-y+3)(x-y-3)
x2一2xy十y2一9
已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值.
x2-2xy+y2-9
因式分解：3X2十5xy－2y2＋x＋9y－4
x2十y2一2x一2y一3=0,则2x十y一1的最小值
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）
(3xy-9x2-2y2-6xy)-(6x2+2xy-3xy-y)
(x2+2xy+y2)( x2-xy+y2)2 化简
(x2-2xy+y2)-(x2+2xy+y2)=什么
( x2+xy+y2) ( x2+xy+2y2)-12y4
25(x2+ 2xy +y2)-9(x2-2xy+y2)因式分解.x2,y2是x平方,y平方的意思.2xy就是2xy.快,
计算：(xy-x2)÷xy分之x2-2xy+y2
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=?
(x2+y2)(x2-xy+y2)-2x2y2因式分解
(x2+xy+y2)-4xy(x2+y2)
一(x2十3X)十2(4X十x2),其中X=一2
解方程组 ｛3x2-y2=8 {4x2+12xy+9y2=1 {x2+2xy+y2-4=0 x2+xy+y2=4 4x2-9y2=0 x2-2xy+y2-1=0还有{x2+y2=4xy-y2+4=0x2-----x的平方 y2------y的平方 还有{2x-3y=12x2-3xy+y2-4x+3y-3=0