【x-y】²-【y+2x】【y-2x】=【】【过程】
【x-y】²-【y+2x】【y-2x】=【】【过程】
(2X-Y)²-1(X-2Y)(X+2Y)=? 因式分解 过程
(x-y)² - (-y-2x)(y-2x) 要过程
(x-y)/(2x+2y)与(xy)/(x+y)²通分要过程
数集{(x,y)|y=x²-2x}可用区间表示成------? 过程~~
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
解方程组x^2-y^2=x+y 4x^2-y^2+2x-y=0过程
(3x+y)二次方-3(3x-y)(x+y)-(x-2y)(x+3y)要过程!
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
1、x(x-y)(x+y)-x(x+y)^2