已知{an}是公差为d的等差数列,它的前n项和为Sn,S4=2S2+4,bn=(1+an)/an.(1)若a1=-5/2,求数列{bn}中的最大项和最小项的值(2)若对任意的n∈N*,都有bn≤b8成立,求a1的取值范围
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![已知{an}是公差为d的等差数列,它的前n项和为Sn,S4=2S2+4,bn=(1+an)/an.(1)若a1=-5/2,求数列{bn}中的最大项和最小项的值(2)若对任意的n∈N*,都有bn≤b8成立,求a1的取值范围](/uploads/image/z/677024-8-4.jpg?t=%E5%B7%B2%E7%9F%A5%7Ban%7D%E6%98%AF%E5%85%AC%E5%B7%AE%E4%B8%BAd%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%AE%83%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn%2CS4%3D2S2%2B4%2Cbn%3D%EF%BC%881%2Ban%EF%BC%89%2Fan.%EF%BC%881%EF%BC%89%E8%8B%A5a1%3D-5%2F2%2C%E6%B1%82%E6%95%B0%E5%88%97%7Bbn%7D%E4%B8%AD%E7%9A%84%E6%9C%80%E5%A4%A7%E9%A1%B9%E5%92%8C%E6%9C%80%E5%B0%8F%E9%A1%B9%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E8%8B%A5%E5%AF%B9%E4%BB%BB%E6%84%8F%E7%9A%84n%E2%88%88N%2A%2C%E9%83%BD%E6%9C%89bn%E2%89%A4b8%E6%88%90%E7%AB%8B%2C%E6%B1%82a1%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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