已知│x-y+1│与x2+8x+16互为相反数,求x2+2xy+y2的值.
问题描述:
已知│x-y+1│与x2+8x+16互为相反数,求x2+2xy+y2的值.
x2-4xy+4y2-10x+20y+25
分解因式
答
49
(x-2y-5)*2