若x2+4x+y2-6y+13=0,则(x+2y)(x-2y)的值为----------
若实数x,y满足X2+y2-2X+4y=0,则x-2y的最大值为?
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+4xy+4y2+x+2y-6=0,则x+2y的值为______.
若x2-2x+y2+6y+10=0,求x,y的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
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
已知实数x,y满足x2+4xy+4y2-x-2y+14=0,则x+2y的值为 ___ .
若实数x,y满足x2+y2-2x+4y=0,则x-2y的最大值为______.
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