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回復 1# chwjh32 的帖子

(1)
anan+1=nn+1a 
(2)
n=1時,a1a成立
n=k時,ak2k1ak成立

  ak+1=kk+1aakak+1=kk+1aak1+k1a2k1ak22k1ak+1=2kak+1
(3)
  0a21limnan=limnnan=limnna1n=limn1lnaa1n=021a0
改寫一下即可

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