问一道小学应用题，并求解题思路。谢了。

问一道小学应用题，并求解题思路。谢了。

A number of tennis club are taking part in a competition, Every team in the competition has to play other team just once .How many games will there be altogether if 80 teams take part in the competition ?

所有跟帖： 

• 3160 -大晴天365- ♀ (0 bytes) () 06/27/2015 postreply 19:10:17

• 可 -lihuama- ♀ (88 bytes) () 06/27/2015 postreply 19:14:48

• 一个队不能打 -大晴天365- ♀ (0 bytes) () 06/27/2015 postreply 19:19:51

• 儿子茅塞顿开 了 ! -lihuama- ♀ (34 bytes) () 06/27/2015 postreply 19:26:43

• 明白啥了，为什么不是C(80,2)？哪位给讲讲？ -keessa- ♀ (0 bytes) () 06/27/2015 postreply 21:29:39

• 等明天 回来，让他说说。 -lihuama- ♀ (89 bytes) () 06/27/2015 postreply 21:55:17

• Re -samsam675- ♂ (58 bytes) () 06/28/2015 postreply 04:49:04

• 表舞蹈人家，你难道是推翻了自己的答案的意思？ -keessa- ♀ (0 bytes) () 06/27/2015 postreply 21:32:24