成等差数列的三个正数的和等于15,并且这三个数分别加上2,5,13后成为等比数列{bn}b1,b2,b3.(1)求数列{bn}的通项公式;(2)设Cn=8/5bn,求Tn=log2C1+log2C3+.log2Cn的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/10 19:09:37
![成等差数列的三个正数的和等于15,并且这三个数分别加上2,5,13后成为等比数列{bn}b1,b2,b3.(1)求数列{bn}的通项公式;(2)设Cn=8/5bn,求Tn=log2C1+log2C3+.log2Cn的值](/uploads/image/z/15212432-56-2.jpg?t=%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E7%9A%84%E4%B8%89%E4%B8%AA%E6%AD%A3%E6%95%B0%E7%9A%84%E5%92%8C%E7%AD%89%E4%BA%8E15%2C%E5%B9%B6%E4%B8%94%E8%BF%99%E4%B8%89%E4%B8%AA%E6%95%B0%E5%88%86%E5%88%AB%E5%8A%A0%E4%B8%8A2%2C5%2C13%E5%90%8E%E6%88%90%E4%B8%BA%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%7Bbn%7Db1%2Cb2%2Cb3.%EF%BC%881%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97%7Bbn%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%EF%BC%9B%EF%BC%882%EF%BC%89%E8%AE%BECn%3D8%2F5bn%2C%E6%B1%82Tn%3Dlog2C1%2Blog2C3%2B.log2Cn%E7%9A%84%E5%80%BC)
xݑMJ0$\40WĢKTĺQčQ7ƤY
tŽn}QX%úH:yi25MU\ 3`ɔq)1 )'y-%F INpq|v9wV5(tS|gR!P,)Jzk
UXrڼؖ\U]dοOOxGw)''(:r"|il^D8CsY ̃Ѳ