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数列求和高考题_数列求和高考题20道
教育分析(1)2Sn = 3^n+3n=1,2a1=3+3a1=3for n>=2an = Sn - S(n-1)2an = 3^n - 3^(n-1)an = 3^(n-1)(2)letS= 1.(1......
2024-05-18 【教育分析】
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(1)2Sn = 3^n+3n=1,2a1=3+3a1=3for n>=2an = Sn - S(n-1)2an = 3^n - 3^(n-1)an = 3^(n-1)(2)letS= 1.(1......
2024-05-18 【教育分析】
阅读更多