已知x2-4x+y2-6y+13=0求x2+y2的值?
1.已知X2+Y2-4X-6Y+13=0,求Y2-X2的值
已知x2-4x+y2-6y+13=0求x2+y2的值?
已知x2+y2-4x+6y+13=0,求x2-6xy+9y2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x2+y2+4x-6y+13=0 求x2-2x\x2+3y2
已知x2-4x+y2+6y+13=0,求x-y的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知方程x2 +y2+4x-2y-4=0,求x2 +y2的最大值
已知(x2+y2+3)(x2+y2-2)-6=0,求x2+y2的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知X2-2x+y2+6y+10=0,求(x2-2xy)/(xy+y2)的值
已知xy满足x2+y2-6x+2y+10=0,求立方根号x2-y2的值