kellyme 2010-5-7 12:21
巧算求解
(19921992×199119911992-19911991×199219921993) ×2002=.
kellyme 2010-5-7 13:24
[quote]原帖由 [i]tianba[/i] 于 2010-5-7 13:09 发表 [url=http://ww123.net/baby/redirect.php?goto=findpost&pid=6971479&ptid=4723238][img]http://ww123.net/baby/images/common/back.gif[/img][/url]
20022002 [/quote]
能不能告知详细解题思路啊?.
wip老爸 2010-5-7 15:54
回复 1#kellyme 的帖子
(19921992×199119911992-19911991×199219921993) ×2002
=[1992×(199119911991+1)-1991×(199219921992+1)]×10001 ×2002
= [(1992-1991)+1992×199119911991-1991×199219921992]×10001 ×2002
=10001×2002
=20022002
[[i] 本帖最后由 wip老爸 于 2010-5-7 15:59 编辑 [/i]].