已知数列
的通项公式是
,
,则
中的最大项的项数是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dbc41c73c6e677b52962f607c6c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
更新时间:2018-08-11 15:09:26
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【知识点】 确定数列中的最大(小)项
相似题推荐
【推荐1】在数列
中,
,
,则
的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8827c05075967f3c3569d31cb6b83919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3741a2bb31c3b41fb76d7171b395fdef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77288bfa684c2a9ca00c75743232a0e3.png)
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解题方法
【推荐2】设
是数列
的前
项的和,
,
,如果
是
与
的等差中项,则
的最小值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49763402b2f2023f0ba64c37924267d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c752ebe8516e7d3327f3410473d9a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1097fb9c98cd34f07dda4e365b43c915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b598c8cc1703e4bf247d310bf38ecb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e7fd11fbb08bfd3bed4a2d68b34656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b07b7aca55679753d12162b183d857.png)
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