若x2+4x+y2-6y+13=0,则(x+2y)(x-2y)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
若x2-2x+y2+6y+10=0,求x,y的值
若实数x,y满足X2+y2-2X+4y=0,则x-2y的最大值为?
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
已知实数x,y满足x2+y2-2x+4y=0,则x2+y2的最小值是
已知x2-4x+y2+6y+13=0,求x-y的值
已知x2-2x+y2+6y+10=0,求(2x-y)的值
若x2-2xy-y2-x+Y-1=0 求x-y的值
已知:x2+2x+y2-6y+10=0,求x,y的值.
已知x2+y2+2x-6y+10=0,求x+y的值.
已知x2+4x+y2-2y+5=0,求x,y的值.