数列{an}的前n项和为Sn,已知Sn=(n^2+3n)/2若数列{cn}满足c(n)=a(n)(n为奇数),c(n)=2^n(n为偶数),数列{cn}的前n项和为Tn,当n为偶数时,求Tn答案是Tn=((n^2+2n)/4)+((4/3)((2^n)-1)),
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![数列{an}的前n项和为Sn,已知Sn=(n^2+3n)/2若数列{cn}满足c(n)=a(n)(n为奇数),c(n)=2^n(n为偶数),数列{cn}的前n项和为Tn,当n为偶数时,求Tn答案是Tn=((n^2+2n)/4)+((4/3)((2^n)-1)),](/uploads/image/z/4658699-11-9.jpg?t=%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E5%B7%B2%E7%9F%A5Sn%3D%28n%5E2%2B3n%29%2F2%E8%8B%A5%E6%95%B0%E5%88%97%EF%BD%9Bcn%EF%BD%9D%E6%BB%A1%E8%B6%B3c%EF%BC%88n%EF%BC%89%3Da%EF%BC%88n%EF%BC%89%EF%BC%88n%E4%B8%BA%E5%A5%87%E6%95%B0%EF%BC%89%2Cc%EF%BC%88n%EF%BC%89%3D2%5En%EF%BC%88n%E4%B8%BA%E5%81%B6%E6%95%B0%EF%BC%89%2C%E6%95%B0%E5%88%97%7Bcn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BATn%2C%E5%BD%93n%E4%B8%BA%E5%81%B6%E6%95%B0%E6%97%B6%2C%E6%B1%82Tn%E7%AD%94%E6%A1%88%E6%98%AFTn%3D%EF%BC%88%28n%5E2%2B2n%29%2F4%EF%BC%89%2B%EF%BC%88%EF%BC%884%2F3%EF%BC%89%EF%BC%88%EF%BC%882%5En%EF%BC%89-1%EF%BC%89%EF%BC%89%2C)
数列{an}的前n项和为Sn,已知Sn=(n^2+3n)/2若数列{cn}满足c(n)=a(n)(n为奇数),c(n)=2^n(n为偶数),数列{cn}的前n项和为Tn,当n为偶数时,求Tn答案是Tn=((n^2+2n)/4)+((4/3)((2^n)-1)),
数列{an}的前n项和为Sn,已知Sn=(n^2+3n)/2
若数列{cn}满足c(n)=a(n)(n为奇数),c(n)=2^n(n为偶数),数列{cn}的前n项和为Tn,当n为偶数时,求Tn
答案是Tn=((n^2+2n)/4)+((4/3)((2^n)-1)),
数列{an}的前n项和为Sn,已知Sn=(n^2+3n)/2若数列{cn}满足c(n)=a(n)(n为奇数),c(n)=2^n(n为偶数),数列{cn}的前n项和为Tn,当n为偶数时,求Tn答案是Tn=((n^2+2n)/4)+((4/3)((2^n)-1)),
Sn=(n^2+3n)/2=n(n+3)/2
S(n-1)=(n-1)(n+2)/2
an=Sn-S(n-1)=n(n+3)/2-(n-1)(n+2)/2
an=n(n+3)/2-(n-1)(n+2)/2
=n+1
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