若x+y+4x-8y+20=0,求分式(x-y)/xy的值
若x+y+4x-8y+20=0,求分式(x-y)/xy的值
x²+y²+4x-8y+20=0,求分式x²-y²/xy的值
若x^2+y^2+4x-8y+20=0,求分式x^2-y^2/xy的值
若x²+y²+4x-8y+20=0,求分式/x²-y²xy的值
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
若x+2y=0,xy不等于0,求分式x²+2xy/xy+y²的值
x的平方+y的平方+4x-8y+20=0,求分式x的平方-y的平方/xy的值.
已知1/x-1/y=2001,求分式x-xy-y/x-y的值
,若x^2-y^2=0,求分式x^2-3xy+5y^2/3x^2-2xy+4y^2的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知xy/x+y=二分之一,求分式3x-xy+3y/x-xy+y的值
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.