求解关于数列的应用题2道1.等差数列{An},An>0,A1=3.前n项和为Sn.{Bn}为等比数列,b1=1,b2s2=64,b3s3=960.(1)求An及Bn.(2)求1/b1+1/b2+……+1/bn.2.设数列{An}的前n项和Sn=3n²,{Bn}为等比数列,a
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/02 13:42:20
![求解关于数列的应用题2道1.等差数列{An},An>0,A1=3.前n项和为Sn.{Bn}为等比数列,b1=1,b2s2=64,b3s3=960.(1)求An及Bn.(2)求1/b1+1/b2+……+1/bn.2.设数列{An}的前n项和Sn=3n²,{Bn}为等比数列,a](/uploads/image/z/7641954-18-4.jpg?t=%E6%B1%82%E8%A7%A3%E5%85%B3%E4%BA%8E%E6%95%B0%E5%88%97%E7%9A%84%E5%BA%94%E7%94%A8%E9%A2%982%E9%81%931.%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BD%9BAn%EF%BD%9D%2CAn%EF%BC%9E0%2CA1%3D3.%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn.%EF%BD%9BBn%EF%BD%9D%E4%B8%BA%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2Cb1%3D1%2Cb2s2%3D64%2Cb3s3%3D960.%EF%BC%881%EF%BC%89%E6%B1%82An%E5%8F%8ABn.%EF%BC%882%EF%BC%89%E6%B1%821%2Fb1%2B1%2Fb2%2B%E2%80%A6%E2%80%A6%2B1%2Fbn.2.%E8%AE%BE%E6%95%B0%E5%88%97%EF%BD%9BAn%EF%BD%9D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8CSn%3D3n%26sup2%3B%2C%EF%BD%9BBn%EF%BD%9D%E4%B8%BA%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2Ca)
xV]OV+llqr)~BJH|WAVJ
U7`Ui/O+v*MJsy?ѩOٗɽOskG'gIofvCŽhmEk]yoIg >ZUvc]'ӄѼ]}6Bsً9lxtw
Qϭ{:o#