通项是an=n的平方的数列,怎么求和啊还有n的三次方,都如何求和呢?
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![通项是an=n的平方的数列,怎么求和啊还有n的三次方,都如何求和呢?](/uploads/image/z/1349204-68-4.jpg?t=%E9%80%9A%E9%A1%B9%E6%98%AFan%3Dn%E7%9A%84%E5%B9%B3%E6%96%B9%E7%9A%84%E6%95%B0%E5%88%97%2C%E6%80%8E%E4%B9%88%E6%B1%82%E5%92%8C%E5%95%8A%E8%BF%98%E6%9C%89n%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2C%E9%83%BD%E5%A6%82%E4%BD%95%E6%B1%82%E5%92%8C%E5%91%A2%3F)
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