高二数列题两道1. 设数列1,(1+2),(1+2+2^2),…,(1+2+2^2+...+2^(n-1)),的前n项的和为Sn,则Sn的值为3.记n!=n*(n-1)*(n-2)*.*3*2*1,则2/3! + 3/4! + 4/5! +...+99/100!为希望能有具体过程~谢谢
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 08:11:47
![高二数列题两道1. 设数列1,(1+2),(1+2+2^2),…,(1+2+2^2+...+2^(n-1)),的前n项的和为Sn,则Sn的值为3.记n!=n*(n-1)*(n-2)*.*3*2*1,则2/3! + 3/4! + 4/5! +...+99/100!为希望能有具体过程~谢谢](/uploads/image/z/5602793-41-3.jpg?t=%E9%AB%98%E4%BA%8C%E6%95%B0%E5%88%97%E9%A2%98%E4%B8%A4%E9%81%931.+%E8%AE%BE%E6%95%B0%E5%88%971%2C%EF%BC%881%2B2%EF%BC%89%2C%EF%BC%881%2B2%2B2%5E2%EF%BC%89%2C%E2%80%A6%2C%EF%BC%881%2B2%2B2%5E2%2B...%2B2%5E%28n-1%29%EF%BC%89%2C%E7%9A%84%E5%89%8Dn%E9%A1%B9%E7%9A%84%E5%92%8C%E4%B8%BASn%2C%E5%88%99Sn%E7%9A%84%E5%80%BC%E4%B8%BA3.%E8%AE%B0n%21%3Dn%2A%28n-1%29%2A%28n-2%29%2A.%2A3%2A2%2A1%2C%E5%88%992%2F3%21+%2B+3%2F4%21+%2B+4%2F5%21+%2B...%2B99%2F100%21%E4%B8%BA%E5%B8%8C%E6%9C%9B%E8%83%BD%E6%9C%89%E5%85%B7%E4%BD%93%E8%BF%87%E7%A8%8B%7E%E8%B0%A2%E8%B0%A2)
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 08:11:47