已知x²-5xy+6y²=0(y≠0)求y/x+x/y的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²-5xy+6y²=0(y≠0)求y/x+x/y的值
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²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x-3y=0,求(x²-2xy+y²/x-y)-2y的值
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y
已知x²-7xy+12y²=0(y≠0)求x/y的值
已知x²+y²-2xy-6x+6y+9=0,求x+y的值
已知x²+y-2xy-6x+6y+9=0,求x-y的值