数列{an},a1=8,a4=2,且满足an+2(n+2下)=2an+1(n+1下)-an(n下).已算出an通项为10-2n.设sn=|a1|+|a2|+……+|an|求sn
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![数列{an},a1=8,a4=2,且满足an+2(n+2下)=2an+1(n+1下)-an(n下).已算出an通项为10-2n.设sn=|a1|+|a2|+……+|an|求sn](/uploads/image/z/2715812-44-2.jpg?t=%E6%95%B0%E5%88%97%7Ban%7D%2Ca1%3D8%2Ca4%3D2%2C%E4%B8%94%E6%BB%A1%E8%B6%B3an%2B2%EF%BC%88n%2B2%E4%B8%8B%EF%BC%89%3D2an%2B1%28n%2B1%E4%B8%8B%EF%BC%89-an%28n%E4%B8%8B%EF%BC%89.%E5%B7%B2%E7%AE%97%E5%87%BAan%E9%80%9A%E9%A1%B9%E4%B8%BA10-2n.%E8%AE%BEsn%3D%7Ca1%7C%2B%7Ca2%7C%2B%E2%80%A6%E2%80%A6%2B%7Can%7C%E6%B1%82sn)
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