等差数列
满足
,公差为2,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a889e13ba8518fa34494ed1295078999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90750030105f99f7d133ada48b2e911f.png)
A.96 | B.90 | C.84 | D.78 |
更新时间:2024-05-23 10:43:54
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【推荐1】设等差数列
中,且
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( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2486dfd66d56e99c7f75d4c01388adc.png)
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A.9 | B.18 | C.27 | D.36 |
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单选题
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【推荐2】在等差数列
中,若
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecf69901899bba130968c7a091790d3.png)
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A.14 | B.15 | C.16 | D.8 |
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【推荐1】已知数列
中,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19834f51fbfc5e2557f3da307d39e505.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】若正项等比数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86551283c9dfa1c39bdc9b0dd546803.png)
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A.![]() | B.25 | C.![]() | D.150 |
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