设数列{an}+3a2+3方a3+...+3的n-1次方an=n/3,n属于正整数1.求数列{an}的通项公式2.设bn=n/an,求数列{bn}的前n项和Sn不好意思,写错了是{an}满足a1+3a2+3方a3+···+3的n-1次方an=n/3
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![设数列{an}+3a2+3方a3+...+3的n-1次方an=n/3,n属于正整数1.求数列{an}的通项公式2.设bn=n/an,求数列{bn}的前n项和Sn不好意思,写错了是{an}满足a1+3a2+3方a3+···+3的n-1次方an=n/3](/uploads/image/z/1240627-67-7.jpg?t=%E8%AE%BE%E6%95%B0%E5%88%97%7Ban%7D%2B3a2%2B3%E6%96%B9a3%2B...%2B3%E7%9A%84n-1%E6%AC%A1%E6%96%B9an%3Dn%2F3%2Cn%E5%B1%9E%E4%BA%8E%E6%AD%A3%E6%95%B4%E6%95%B01.%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F2.%E8%AE%BEbn%3Dn%2Fan%2C%E6%B1%82%E6%95%B0%E5%88%97%7Bbn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%E4%B8%8D%E5%A5%BD%E6%84%8F%E6%80%9D%EF%BC%8C%E5%86%99%E9%94%99%E4%BA%86%E6%98%AF%7Ban%7D%E6%BB%A1%E8%B6%B3a1%2B3a2%2B3%E6%96%B9a3%2B%C2%B7%C2%B7%C2%B7%2B3%E7%9A%84n-1%E6%AC%A1%E6%96%B9an%3Dn%2F3)
设数列{an}+3a2+3方a3+...+3的n-1次方an=n/3,n属于正整数1.求数列{an}的通项公式2.设bn=n/an,求数列{bn}的前n项和Sn不好意思,写错了是{an}满足a1+3a2+3方a3+···+3的n-1次方an=n/3
设数列{an}+3a2+3方a3+...+3的n-1次方an=n/3,n属于正整数
1.求数列{an}的通项公式
2.设bn=n/an,求数列{bn}的前n项和Sn
不好意思,写错了
是{an}满足a1+3a2+3方a3+···+3的n-1次方an=n/3
设数列{an}+3a2+3方a3+...+3的n-1次方an=n/3,n属于正整数1.求数列{an}的通项公式2.设bn=n/an,求数列{bn}的前n项和Sn不好意思,写错了是{an}满足a1+3a2+3方a3+···+3的n-1次方an=n/3
你把题目写详细点
设An=a1+3a2+3方a3+···+3的n-1次方an=n/3
则An-A(n-1)=3的n-1次方an=n/3-(n-1)/3=1/3
3的n-1次方an=1/3
an=1/(3的n次方)
bn=3的n次方·n,这个可以用错项方法解得,相信你也了
数列{an}+3a2+3方a3+...+3的n-1次方an=n/3
数列{an}+3a2...
加号是怎么回事啊!!
(1/3)数列题:设{an}是公差不为0的等差数列,Sn为其前n项和,满足a2方+a3方=a4方+a5方,S7=7.第一问求出了a...(1/3)数列题:设{an}是公差不为0的等差数列,Sn为其前n项和,满足a2方+a3方=a4方+a5方,S7=7.第一问求
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