作业帮-（x2-2xy-y2)+(5x2-2xy-3y2)-（x2-2xy-y2)+(5x2-2xy-3y2)化简
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-（x2-2xy-y2)+(5x2-2xy-3y2)-（x2-2xy-y2)+(5x2-2xy-3y2)化简
-（x2-2xy-y2)+(5x2-2xy-3y2)
-（x2-2xy-y2)+(5x2-2xy-3y2)
化简
-（x2-2xy-y2)+(5x2-2xy-3y2)-（x2-2xy-y2)+(5x2-2xy-3y2)化简
-(x² - 2xy - y²) + (5x² - 2xy - 3y²)
= -x² + 2xy + y² + 5x² - 2xy - 3y²
= 4x² - 2y²
原式=4x^2-2y^2
=（2x+√2y）（2x-√2y）
4x2-3y2+2xy-4x2+5x2
4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy
已知x2+y2+4x-2y+5=0,求x2+2xy+y2值
2(x-xy)-3(2x2-3xy）2[x2（2x2-xy+y2)]
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）
x2-xy-2y2-x+5y-2
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X2+xy-12y2-2x+27y+5因式分解
(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)+(5x2-2xy-3y2)-（x2-2xy-y2)+(5x2-2xy-3y2)化简
x2-2xy+y2-9
已知x/y=3/5,求 (x2-xy+2y2)/(x2+2xy-y2)的值
已知x2-3xy=-5,xy+y2=3,求x2-2xy+y2.
x2-2xy+y2=4 x2+y2-x-y=6 解不等式x2-2xy+y2=4 x2+y2-x-y=6 解不等式
已知x2+xy=2,y2+xy=5,则二分之一x2+xy+二分之一y2的值是多少x2是x的平方