2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
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
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值
已知x²+4x+y²-10y+29=0 求【x+2y】÷【x²-2y²】的值
已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值
x²-4y² x+2y
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