数列1/2,1/2+3,1/2+3+4,...,1/2+3+4+...+(k+1),...的前n项和Sn=最终答案等于11/9-2/3(1/n+1 + 1/n+2 + 1/n+3)
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![数列1/2,1/2+3,1/2+3+4,...,1/2+3+4+...+(k+1),...的前n项和Sn=最终答案等于11/9-2/3(1/n+1 + 1/n+2 + 1/n+3)](/uploads/image/z/3754890-18-0.jpg?t=%E6%95%B0%E5%88%971%2F2%2C1%2F2%2B3%2C1%2F2%2B3%2B4%2C...%2C1%2F2%2B3%2B4%2B...%2B%28k%2B1%29%2C...%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%3D%E6%9C%80%E7%BB%88%E7%AD%94%E6%A1%88%E7%AD%89%E4%BA%8E11%2F9-2%2F3%281%2Fn%2B1+%2B+1%2Fn%2B2+%2B+1%2Fn%2B3%EF%BC%89)
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