(x+2y)²-2(x-y)(x-y)+2y(x-3y)帮忙化简下,准确一点哦,
(x+2y)²-2(x-y)(x-y)+2y(x-3y)帮忙化简下,准确一点哦,
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
|x+2y+3|+(2x+y)²=0求x²-xy+y²
设P(x,y)是圆x²+y²+8y+12=0上的一点,√(x²+y²-2x-2y
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
(x+y)²-2(x²-y²)+(y-x)²
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy
x²-4y² x+2y
帮忙化简下(2x+y)^2-(2x+y)(x-y)-2(x-2y)(x+2y)