求证 1/(n+1)+1(n+2)+.+1(3n+1)>1图片里的1/2(1/n + 1/3n )怎么出来的 谁告诉下几何意义
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![求证 1/(n+1)+1(n+2)+.+1(3n+1)>1图片里的1/2(1/n + 1/3n )怎么出来的 谁告诉下几何意义](/uploads/image/z/3839197-13-7.jpg?t=%E6%B1%82%E8%AF%81+1%2F%EF%BC%88n%2B1%EF%BC%89%2B1%EF%BC%88n%2B2%EF%BC%89%2B.%2B1%EF%BC%883n%2B1%EF%BC%89%EF%BC%9E1%E5%9B%BE%E7%89%87%E9%87%8C%E7%9A%841%2F2%EF%BC%881%2Fn++%2B+1%2F3n+%EF%BC%89%E6%80%8E%E4%B9%88%E5%87%BA%E6%9D%A5%E7%9A%84+%E8%B0%81%E5%91%8A%E8%AF%89%E4%B8%8B%E5%87%A0%E4%BD%95%E6%84%8F%E4%B9%89)
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