1/n(n+1)=1/n-1/(n+1)那1/n(n+2)=麻烦详细点,

题目详情

1/n(n+1)=1/n-1/(n+1) 那1/n(n+2)= 麻烦详细点,

▼优质解答

答案和解析

1/n(n+2)
=(1/2)(n+2-n)/n(n+2)
=(1/2)(n+2)/n(n+2)-(1/2)(n/n(n+2))
=(1/2)(1/n - 1/(n+2))

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