1.若x2+4x+y2-2y+5=0,则x+y=?
已知x2+4x+y2-2y+5=0,则x2+y2=______.
已知x2+4x+y2-2y+5=0,求x,y的值.
已知x2+y2-2x-4y+5=0,则1xy+1(x+1)(y+1)+1(x+2)(y+2)+…+1(x+2010)(y
若实数x,y满足X2+y2-2X+4y=0,则x-2y的最大值为?
已知实数x,y满足x2+y2-2x+4y=0,则x2+y2的最小值是
已知2x+y=7,x2+y2=5,求(4x+2y)2-3x2-y2+2(1-y2)的值.
若4x2+9y2-4x-12y+5=0,则2x+32y
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
若x-y=2,x2-y2=10,则x+y= ___ .
若x2-2xy-y2-x+Y-1=0 求x-y的值
已知实数x,y满足x2+y2+2x-4y+5=0
若x2+4y2+2x-4y+2=0求5x2+16y2的算术平方根