已知等比数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd83f0dc671aed388609825cada8fa43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
A.![]() | B.1 | C.2 | D.4 |
更新时间:2024-01-28 13:24:35
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【知识点】 等比数列下标和性质及应用
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单选题
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【推荐1】已知等比数列
满足
,且
,则
+
+
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bcf7b4e318f4c6aeb307fff490a20e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3202b06e4227d1276cdd9c14aabdc7e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8809d142c1a7882a03f5ce1a21f1ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/521aaf33d73c04b591cf627e2c42b2d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57ae3e11bf1282b56d7e38e3b5594a1.png)
A.45 | B.36 | C.16 | D.25 |
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较易
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【推荐2】已知各项均为正数的等比数列
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f876a10af5a1bdff5deb86b27bc177f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c19f4e90a233b3fc8232651f64cb37b.png)
A.25 | B.20 | C.![]() | D.10 |
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