等差数列{an}中,已知a3+a8=12,那么S10的值是_____ .
更新时间:2016-12-04 03:38:20
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【知识点】 等差数列
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【推荐1】已知
是等差数列,公差d不为零,若
成等比数列,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b714b462bd3f990d750b78a13f842a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3735c307e6c0afeb4d2c17bd23ec5e99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
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解题方法
【推荐2】已知数列
满足
,则
=__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ded3f6625ac39a0823194bfc2e541f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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