很有思想的小猪 当前离线
顶级富豪
Originally posted by 冰雨人生 at 2005-4-7 05:46 PM: 13 颗树排成各种直线。美一直线上有(must)4颗树. 请问可派成多少排?
TOP
Originally posted by 驴子 at 2005-4-7 09:27 PM: 别吵架 给答案,最好带证明过程
Originally posted by lapine at 2005-4-7 10:48 PM: 给个答案吧!我以后好去骗别人!
Originally posted by 驴子 at 2005-4-7 10:53 PM: 楼主说说答案吧 好奇呢
Originally posted by FEEDER at 2005-4-8 01:45 AM: 不是PHD的做做玩玩, 怕脑筋生锈.;);) 9排的做出来了. 关键在于相交的三条线保证三角形边两点联线不分别平行与三角形的边即可. ABCD AEHJ AFKM BEFL BHIK BGJM CGHF CJKL DJIF ABCDEFGHIJKLM =13 ...