x²+y²+1.25=2x+y 求X与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
已知x²y²+x²+y²=10xy-16 求x,y
求圆x²+y²-10x-10y=0 与 x²+y²-6x+2y-40=0 的公共
已知(x²+y²)(x²+y²-6)+9=0 ,求x²+y²
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
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy