第n数加上关于n的函数是第n+1个数,那这种数列怎么求和第n数加上关于n的函数是第n+1个数,那怎么求给定的数到第n个数的和?我想问问从A1到An的和,并且要写出表达式(不是那种x1+x2+x3………
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![第n数加上关于n的函数是第n+1个数,那这种数列怎么求和第n数加上关于n的函数是第n+1个数,那怎么求给定的数到第n个数的和?我想问问从A1到An的和,并且要写出表达式(不是那种x1+x2+x3………](/uploads/image/z/1549812-12-2.jpg?t=%E7%AC%ACn%E6%95%B0%E5%8A%A0%E4%B8%8A%E5%85%B3%E4%BA%8En%E7%9A%84%E5%87%BD%E6%95%B0%E6%98%AF%E7%AC%ACn%2B1%E4%B8%AA%E6%95%B0%2C%E9%82%A3%E8%BF%99%E7%A7%8D%E6%95%B0%E5%88%97%E6%80%8E%E4%B9%88%E6%B1%82%E5%92%8C%E7%AC%ACn%E6%95%B0%E5%8A%A0%E4%B8%8A%E5%85%B3%E4%BA%8En%E7%9A%84%E5%87%BD%E6%95%B0%E6%98%AF%E7%AC%ACn%2B1%E4%B8%AA%E6%95%B0%2C%E9%82%A3%E6%80%8E%E4%B9%88%E6%B1%82%E7%BB%99%E5%AE%9A%E7%9A%84%E6%95%B0%E5%88%B0%E7%AC%ACn%E4%B8%AA%E6%95%B0%E7%9A%84%E5%92%8C%3F%E6%88%91%E6%83%B3%E9%97%AE%E9%97%AE%E4%BB%8EA1%E5%88%B0An%E7%9A%84%E5%92%8C%EF%BC%8C%E5%B9%B6%E4%B8%94%E8%A6%81%E5%86%99%E5%87%BA%E8%A1%A8%E8%BE%BE%E5%BC%8F%EF%BC%88%E4%B8%8D%E6%98%AF%E9%82%A3%E7%A7%8Dx1%2Bx2%2Bx3%E2%80%A6%E2%80%A6%E2%80%A6)
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