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級數和問題02

級數和問題02

請各位大大幫幫忙,要如何求出下面的級數和?謝謝!
nk=1k+4k(k+1)(k+2)=23n+3(n+1)(n+2) 
k=1k+4k(k+1)(k+2)=23 

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回復 1# shmilyho 的帖子

  k+4kk+1k+2=k+2+2kk+1k+2=k+2kk+1k+2+2kk+1k+2=1kk+1+2kk+1k+2=k11k+1+1kk+11k+1k+2

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