数列{an}中a1=4,a(n+1)=an/2+2/an(I)设bn=lg((an+2)/(an-2)),求证bn等比数列(II)求an
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![数列{an}中a1=4,a(n+1)=an/2+2/an(I)设bn=lg((an+2)/(an-2)),求证bn等比数列(II)求an](/uploads/image/z/5556276-36-6.jpg?t=%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%ADa1%3D4%2Ca%28n%2B1%29%3Dan%2F2%2B2%2Fan%EF%BC%88I%EF%BC%89%E8%AE%BEbn%3Dlg%28%EF%BC%88an%2B2%EF%BC%89%2F%28an-2%29%EF%BC%89%2C%E6%B1%82%E8%AF%81bn%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%EF%BC%88II%EF%BC%89%E6%B1%82an)
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