已知等比数列
的各项均为正数,若
成等差数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27047c478842611c2dbf9053ab6f9e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bf56512cc4d9d78744d083ef5ad485.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2024·天津和平·一模 查看更多[1]
更新时间:2024-03-25 19:03:21
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【推荐1】椭圆C:
左,右焦点分别为
、
,P为椭圆C上一点,且
垂直x轴,若
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,
成公差为2的等差数列,则椭圆C的方程是( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】若两个等差数列
、
的前
项和分别为
、
,且满足
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec00f8859a491cdd60a68ce94dcb7a7.png)
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解题方法
【推荐1】已知等比数列
的前
项和
,满足
,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/0bb798f644805e5386617b3b11aab05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
A.16 | B.32 | C.81 | D.243 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】等比数列
的前
项和为
,公式
,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/535fd9605b90ac7f0fed6025be9f851f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e70b59a8ca3b9b8c2bd922d3408bbe.png)
A.![]() | B.4 | C.15 | D.![]() |
您最近一年使用:0次