已知X-3Y+4=0.求分式X^2-XY-6Y^2/2X+4Y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-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值. 解一道分式题已知1/x-1/y=3 求分式(4x-5xy-4y)/(3x-2xy-3y)的值. 已知X-3Y+4=0.求分式X^2-XY-6Y^2/2X+4Y的值 已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值 已知,1/x+1/y=5.,求分式3x+xy+3y/x-2xy+y的值 已知3x-4y=0,求分式x^2+2xy/3x^2-y^2的值 已知3x-4y=0,求分式x平方+2xy/3x平方-y平方的值. 1.已知3/x=4/y,求分式x^2+2xy/3x^2-y^2的值.2.已知1/x-1/y=3,求分式3x+2xy-3y 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-1/2y=1/3,求分式(2x+3xy-4y)/(x-3xy-2y)的值 已知1/x+1/y=4,求分式4x+3xy+4y/-3x+2xy-3y的值