2x2+2xy+y2-2x+1=0,求X,Y的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
若x2-2xy-y2-x+Y-1=0 求x-y的值
(x+y)(x+y+1)=0 求x2+y2+2xy的值
x(x-1)-(x2-y)=-3,求x2-y2-2xy的值
x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知x-y+1,X2+Y2=25 求(x+y)2和x2-xy+y2的值
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值
已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值
已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值