|x-y+1|与x²+8x+16互为相反数,求x²+2xy+y²的值急!

|x-y+1|与x²+8x+16互为相反数,求x²+2xy+y²的值急!
|x-y+1|与x²+8x+16互为相反数,求x²+2xy+y²的值
急!

|x-y+1|与x²+8x+16互为相反数,求x²+2xy+y²的值急!
x²+8x+16 也就是x+4的平方 大于等于0 |x-y+1|大于等于0 若为相反数 必须都为0 x-y=-1 所以x=1+y x =-4 x y都知道了 下面很简单了吧