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
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

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
当10-2n5 即a6 .a7.an

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