证明:1/n(n+1)=1/n-1/n+1要从左边得出右边

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证明:1/n(n+1)=1/n-1/n+1要从左边得出右边
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证明:1/n(n+1)=1/n-1/n+1要从左边得出右边
证明:1/n(n+1)=1/n-1/n+1
要从左边得出右边

证明:1/n(n+1)=1/n-1/n+1要从左边得出右边
[(n+1)-n]/n(n+1)
=(n+1)/n(n+1) -n/n(n+1)
=1/n-1/(n+1)