谢谢高手解答x²-xy=2,-xy+y²=5求x²-2xy+ y²,x²
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
x/y=2,求分式x²-xy+3y²/x²+xy+6y²
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
1-x²+2xy-y²
已知x²y²+x²+y²=10xy-16 求x,y
问已知x²+y²=7,xy=-2,求5x²-3xy-4y²-11xy-7x&su
已知x/y=3,求x²+2xy-3y²/x²-xy+y³的值
已知x²-xy-2y²=0,且x、y不等于0,求代数式x²-2xy-5y²除x&
计算:(1).(-2xy²)*(3x²y)²
已知x²-xy-y²=0,且x≠0,y≠0.求代数式(x²-2xy-5y²)/(