答案时d 吧?
if for all x, x^2+ax+b=(x+c)^2, then a=?
1.b=0
2.c=-3
答案时b
但我觉得由提干,b=c,a=2c,由1得 c=0, a=0
所以应为d
http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=66716&replyID=&skin=0
以前问过的,搜一下就出来了
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