changshiyi的个人空间

changshiyi： 求助！

已知tan a=根号三，派<a<32派，那么cos a-sin a的值

2009-08-23 08:14 来自版块 - 

changshiyi： 英语英语~~

the way he did it was different (from what) we were used to为什么用from what

2009-07-15 22:23 来自版块 - 

changshiyi： 一道英语题~请求帮助

in the office i never seem to have time until 5:30,（by which） many people have got home为什么on which不可以呢？

2009-07-11 13:56 来自版块 - 

changshiyi： 求助！！！

定义域为N+，函数值也是正整数的函数f（x），对任何n属于N+，有f（n+1)>f(n).f(f(n))=3n求f(4),f(5)

2009-06-07 19:20 来自版块 -