已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知x²+y²=3xy且xy≠0,求x²y-²+x-²y²的
|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(x²+y²)(x²+y²-6)+9=0 ,求x²+y²
已知x²-xy-y²=0,且x≠0,y≠0.求代数式(x²-2xy-5y²)/(
分式 已知y-2x=0(x≠0且y≠0),求代数式(x²-y²)(x²-xy+y²
已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²
已知x²y²+x²+y²=10xy-16 求x,y
已知2x+3y=0,求代数式1.5x+4y/3x-2y 2.x²+xy-y²/x²-xy+
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