证明1/(n+1)+1/(n+2)+1/(n+3)+……+1/(n+n)

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证明1/(n+1)+1/(n+2)+1/(n+3)+……+1/(n+n)

证明1/(n+1)+1/(n+2)+1/(n+3)+……+1/(n+n)
证明1/(n+1)+1/(n+2)+1/(n+3)+……+1/(n+n)

证明1/(n+1)+1/(n+2)+1/(n+3)+……+1/(n+n)
利用柯西不等式:
∵[1/(n+1)+1/(n+2)+……+1/(2n)]^2