已知等比数列
的前
项和为
,且
,若
,则
( )
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7cd20710df55e21e21b0957501f14f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696aff7fad22fff57f00d7c07eb87405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2017-11-28 23:51:02
|
相似题推荐
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】首项为正数,公差不为0的等差数列
,其前n项和为
.现有下列4个命题
①若
,则
;
②若
,则使
的最大的n为15;
③若
,
,则
中
最大;
④若
,则
.
其中正确的命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c98aaba1203b133a3b019d6102e367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad7a55c48c3686b4580ce198fde558fc.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39b79cfc789f5d173961db973d1390c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49763402b2f2023f0ba64c37924267d3.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81974dea9c97235cfeba7551bc0e696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c864fb2f798930481536e52374adc6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d013861990cf331c82eb453416ae31bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eed39c7d611309b01476c15ab242308.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9a959dda5985723ef15d5d31ea6a25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d77bb6b1a5ca128223c897cf09ba19d.png)
其中正确的命题的个数是( )
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
单选题
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适中
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【推荐2】已知等差数列
的前
项为
,
且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e191086446263b7bbbd93613577c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff149acfdadb62fd6a60a3226c85b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105b799eadc3f9a53463a796d3ce77c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
A.90 | B.100 | C.110 | D.120 |
您最近一年使用:0次
单选题
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适中
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解题方法
【推荐1】已知数列
的前
项和为
,前
项积为
,且
,
.若
,则数列
的前
项和
为( )
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4f39207a3ef7e42e5c5b9ca2015fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cb49d4dff7e41eef863b1aa2847fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30136113176ba7fe660e998d0873157.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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适中
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【推荐2】设等比数列
的前n项和为
,且满足
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2348d5068480809ea002ebc2d3261b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81c68c6e1ecc9657768b37ce4ac1767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf075d2aecdc4e922d911194cf9533e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57f21b8e7ef00ec1397e480e7578b09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.4 | B.5 | C.8 | D.9 |
您最近一年使用:0次