计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c09b0acf556fa8bd656fc7e6ecc78c0.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c09b0acf556fa8bd656fc7e6ecc78c0.png)
更新时间:2021-03-24 11:42:58
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【推荐1】已知数列
和数列
,
,
.设
,则数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080a8ea102e192d1363d6ac6e3e82430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
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【推荐2】已知正项数列{an}满足a1=2且an+12﹣2an2﹣anan+1=0,令bn=(n+2)an,则数列{bn}的前8项的和等于 __ .
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