1.已知数列{a(n)}满足a(n)a(n+1)a(n+2)a(n+3)=24,且a1=1 a2=2 a3=3则a1+a2+a3+...+a2014=2.数列{a(n)}的首项为1,数列{b(n)}为等比数列且b(n)=a(n+1)/a(n),若b4b5=2则a9=3.设Sn Tn分别是等差数列{a(n)}{b(n)}的前项和,已知Sn/Tn=2
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/03 17:36:40
![1.已知数列{a(n)}满足a(n)a(n+1)a(n+2)a(n+3)=24,且a1=1 a2=2 a3=3则a1+a2+a3+...+a2014=2.数列{a(n)}的首项为1,数列{b(n)}为等比数列且b(n)=a(n+1)/a(n),若b4b5=2则a9=3.设Sn Tn分别是等差数列{a(n)}{b(n)}的前项和,已知Sn/Tn=2](/uploads/image/z/12581498-2-8.jpg?t=1.%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ba%28n%29%7D%E6%BB%A1%E8%B6%B3a%28n%29a%28n%2B1%29a%28n%2B2%29a%28n%2B3%29%3D24%2C%E4%B8%94a1%3D1+a2%3D2+a3%3D3%E5%88%99a1%2Ba2%2Ba3%2B...%2Ba2014%3D2.%E6%95%B0%E5%88%97%7Ba%28n%29%7D%E7%9A%84%E9%A6%96%E9%A1%B9%E4%B8%BA1%2C%E6%95%B0%E5%88%97%7Bb%28n%29%7D%E4%B8%BA%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E4%B8%94b%28n%29%3Da%28n%2B1%29%2Fa%28n%29%2C%E8%8B%A5b4b5%3D2%E5%88%99a9%3D3.%E8%AE%BESn+Tn%E5%88%86%E5%88%AB%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ba%28n%29%7D%7Bb%28n%29%7D%E7%9A%84%E5%89%8D%E9%A1%B9%E5%92%8C%2C%E5%B7%B2%E7%9F%A5Sn%2FTn%3D2)
xRN@/ ڙS)J3bmv*JiKh x(&LxK+~wfHH説*ysq=|;[ߑ"l. Z^Ͽ%Q$n0L%'mmFlَ*}JIд}^&