已知x^2-xy-5y^2=0,求分式y/(x-y)-(x-y)/x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x-5y=0,求分式【(3x+y)/(x的2次方-2xy+y的2次方)】×(y-x)的值
已知x^2-xy-5y^2=0,求分式y/(x-y)-(x-y)/x的值
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)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
八下数学分式(1)已知1/x-1/y=5,求分式3x+5xy-3y/x-3xy-y的值(2)已知x+1/x=3,求分式x
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?
已知1/x-1/y=3,求分式(4x-5xy-4y)/(3x-2xy-3y)的值
已知x^2+xy-2y^2=0 (x不等于0,y不等于0),求x/y-y/x-(x^2+y^2)/xy的值
已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值