X²-Y²=2XY,求(X-Y)÷(X+Y)
|x+2y+3|+(2x+y)²=0求x²-xy+y²
已知x²y²+x²+y²=10xy-16 求x,y
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
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
x²+y²+4x-8y+20=0,求(x²-y²)÷xy的解
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-xy+y³的值
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy
已知3x+2y=0,求代数式(x²+xy-y²)÷(x²-xy+y²)的值.