1.已知数列{an}是等差数列,其中a2=22 ,a7=7 (1)求数列{an}的通项公式 (2)设数列{an}的前n项和为Sn,求Sn的最大值.2.在各项为正数的等比数列{an}中,a1xa2xa3=27,a2+a4=30 试求:(1)a1和公比q (2)前6
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![1.已知数列{an}是等差数列,其中a2=22 ,a7=7 (1)求数列{an}的通项公式 (2)设数列{an}的前n项和为Sn,求Sn的最大值.2.在各项为正数的等比数列{an}中,a1xa2xa3=27,a2+a4=30 试求:(1)a1和公比q (2)前6](/uploads/image/z/400356-36-6.jpg?t=1.%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%EF%BD%9Ban%7D%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%85%B6%E4%B8%ADa2%3D22+%2Ca7%3D7+%281%29%E6%B1%82%E6%95%B0%E5%88%97%EF%BD%9Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F+%EF%BC%882%29%E8%AE%BE%E6%95%B0%E5%88%97%EF%BD%9Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2C%E6%B1%82Sn%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC.2.%E5%9C%A8%E5%90%84%E9%A1%B9%E4%B8%BA%E6%AD%A3%E6%95%B0%E7%9A%84%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E4%B8%AD%2Ca1xa2xa3%3D27%2Ca2%2Ba4%3D30+%E8%AF%95%E6%B1%82%EF%BC%9A%EF%BC%881%29a1%E5%92%8C%E5%85%AC%E6%AF%94q+%EF%BC%882%29%E5%89%8D6)
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