问题描述:
数列的裂项求和问题
a[n]=1/[n(n+2)] 求n项和
1/[n(n+2)]=1/n-1/(n+2)
1-1/3+1/2-1/4+1/3-1/5+1/4-1/6 .
a[n]=1/[n(n+2)] 求n项和
1/[n(n+2)]=1/n-1/(n+2)
1-1/3+1/2-1/4+1/3-1/5+1/4-1/6 .
问题解答:
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