已知x²+y²+2xy-2x-2y+1=0,则(x+y)^2010=
已知x²+y²+2xy-2x-2y+1=0,则(x+y)^2010=
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
|x+2y+3|+(2x+y)²=0求x²-xy+y²
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
已知x+y=2,则1/2x²+xy+1/2y²
已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²
已知|x+2|+(y+1²=0,求x²+(2xy-3y²)-2(x²+xy-2y
已知x/y=1/2,则x²-3xy+2y²/2x²-3xy+7y²
已知x²-xy-y²=0,且x≠0,y≠0.求代数式(x²-2xy-5y²)/(
1、已知xy满足(x+1)²+1y+21=0试求-2xy·5x²y+(0.5x²y&sup