題目如下

所有跟帖： 

• 是 0 吧? -yangyangw- ♀ (0 bytes) () 11/04/2018 postreply 08:54:37

• 阿，看錯了， 以為是 inverse function，那應該是 k'(2)=-f'(2)/16 , k'(2)= -1/4 -yangyangw- ♀ (0 bytes) () 11/04/2018 postreply 10:45:41

• k'(2)=-f'(2)/sqr(f(2))=-3/16 -oops_yz- ♀ (0 bytes) () 11/04/2018 postreply 09:59:51

• 這個好像是對的，是吧？k'(2)=f'(2)/sqr(f(2))=3/16 -nanbudao- ♀ (0 bytes) () 11/04/2018 postreply 10:26:36

• I left out "-", added -oops_yz- ♀ (0 bytes) () 11/04/2018 postreply 11:14:34

• oops_yz: 你是對的！ -nanbudao- ♀ (0 bytes) () 11/04/2018 postreply 14:11:16

• this is an easy and basic derivative question. -雲遊方丈- ♂ (1462 bytes) () 11/09/2018 postreply 04:40:14