若x^2+y^2+4x-8y+20=0,求分式x^2-y^2/xy的值
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
若x^2+y^2+4x-8y+20=0,求分式x^2-y^2/xy的值
若x+2y=0,xy不等于0,求分式x²+2xy/xy+y²的值
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
,若x^2-y^2=0,求分式x^2-3xy+5y^2/3x^2-2xy+4y^2的值
若x+y+4x-8y+20=0,求分式(x-y)/xy的值
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*y的值
已知1/x-1/y=5,求分式y+xy-x/2x+7xy-2y的值.
已知1/X-1/y=5,求分式(y+xy-x)/(2x+7xy-2y)的值
已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值
1/x+1/y=3.求分式3x-2xy+3y/x+xy+y的值