若x2-2xy-y2-x+Y-1=0 求x-y的值

若X2+Y2-2X-6Y+10=0 ,求（x2-y2)/xy的值 若x2-2xy-y2-x+Y-1=0 求x-y的值 若x2-2xy-y2-x+Y-1=0 求x-y的值 已知x2+y2+4x-2y+5=0,求x2+2xy+y2值 若x、y满足x2+2y2-2xy-2y+1=0,求xy的值. 若x、y满足x2+2y2-2xy-2y+1=0,求xy的值. (x+y)(x+y+1)=0 求x2+y2+2xy的值 已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以（x2+y2/xy）2乘1/x+y的值 x2+2y2-2xy-2y+1=0求：x+2y的值 x2-2xy-3y2=0,其中x,y均不为零,求（y-x）/x2-xy/2x-y-y2/xy-x 若x/y=2,求x2-2xy-3y2/x2-6xy-7y2的值 若2分之x=3分之y,求x2-6xy-7y2分之x2-2xy-3y2 已知X2-2x+y2+6y+10=0,求（x2-2xy）/(xy+y2)的值 已知y/x=1/2,求(x2+2xy+y2)/﹙x2-xy-2y2)的值. 2x2+2xy+y2-2x+1=0,求X,Y的值 已知x-y+1,X2+Y2=25 求（x+y）2和x2-xy+y2的值 若2x+y=0则(x2+xy+y2)/(2xy-x2)的值 若x(x-1)-(x2-y)=7,求二分之一x2+y2-xy的值