关于高二数列一个数列1,2,2,3,3,3,4,4,4,4,5,.它的首项是1,随后两项都是2,接下来3项都是3,再接下来的4项都是4..以此类推,记Sn为数列的前n项和,则S120=_______参考公式 1^2+2^2+3^2+.+n^2=1/6 * n(n+1)(2n+1)想要
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![关于高二数列一个数列1,2,2,3,3,3,4,4,4,4,5,.它的首项是1,随后两项都是2,接下来3项都是3,再接下来的4项都是4..以此类推,记Sn为数列的前n项和,则S120=_______参考公式 1^2+2^2+3^2+.+n^2=1/6 * n(n+1)(2n+1)想要](/uploads/image/z/1159252-52-2.jpg?t=%E5%85%B3%E4%BA%8E%E9%AB%98%E4%BA%8C%E6%95%B0%E5%88%97%E4%B8%80%E4%B8%AA%E6%95%B0%E5%88%971%2C2%2C2%2C3%2C3%2C3%2C4%2C4%2C4%2C4%2C5%2C.%E5%AE%83%E7%9A%84%E9%A6%96%E9%A1%B9%E6%98%AF1%2C%E9%9A%8F%E5%90%8E%E4%B8%A4%E9%A1%B9%E9%83%BD%E6%98%AF2%2C%E6%8E%A5%E4%B8%8B%E6%9D%A53%E9%A1%B9%E9%83%BD%E6%98%AF3%2C%E5%86%8D%E6%8E%A5%E4%B8%8B%E6%9D%A5%E7%9A%844%E9%A1%B9%E9%83%BD%E6%98%AF4..%E4%BB%A5%E6%AD%A4%E7%B1%BB%E6%8E%A8%2C%E8%AE%B0Sn%E4%B8%BA%E6%95%B0%E5%88%97%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2C%E5%88%99S120%3D_______%E5%8F%82%E8%80%83%E5%85%AC%E5%BC%8F+1%5E2%2B2%5E2%2B3%5E2%2B.%2Bn%5E2%3D1%2F6+%2A+n%28n%2B1%29%282n%2B1%29%E6%83%B3%E8%A6%81)
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