来自金源的问题
已知x2+y2+8x+6y+25=0,求x2−4y2x2+4xy+4y2−xx+2y的值.
已知x2+y2+8x+6y+25=0,求x2−4y2x2+4xy+4y2−xx+2y的值.
1回答
2020-11-17 14:58
已知x2+y2+8x+6y+25=0,求x2−4y2x2+4xy+4y2−xx+2y的值.
已知x2+y2+8x+6y+25=0,求x2−4y2x2+4xy+4y2−xx+2y的值.
由x2+y2+8x+6y+25=0得(x+4)2+(y+3)2=0,
解得:x=-4,y=-3,
∴原式=(x+2y)(x−2y)(x+2y)