1/n-1/(n+1)

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1/n-1/(n+1)1/n-1/(n+1)1/n-1/(n+1)1/n-1/(n+1)n=1,1-1/2=1/2n=2,1/2-1/3=1/6n=3,1/3-1/4=1/12.1/n-1/(n+1)

1/n-1/(n+1)
1/n-1/(n+1)

1/n-1/(n+1)
1/n-1/(n+1)
n=1,1-1/2=1/2
n=2,1/2-1/3=1/6
n=3,1/3-1/4=1/12
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1/n-1/(n+1)就是数列1/2,1/6,1/12,.1/n(n+1)的通式.

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