1 . 在等比数列
中,前
项和
,则实数
的值为______ .
![](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/98ff595f6764820fbb78318af9458158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
2 . 假设在某种细菌培养过程中,正常细菌每小时分裂1次(1个正常细菌分裂成2个正常细菌和1个非正常细菌),非正常细菌每小时分裂1次(1个非正常细菌分裂成2个非正常细菌).若1个正常细菌经过14小时的培养,则可分裂成的细菌的个数为______ .
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2024-06-18更新
|
256次组卷
|
5卷引用:2024届青海省西宁市大通县高考四模数学(理)试卷
3 . 在正项等比数列
中,
,
是
的两个根,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb7d4db5d7994156d24c4d05cc04232.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e35eeaabd951fb09b2926807da3685b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e5562c409c242b957d45d897d5beb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb7d4db5d7994156d24c4d05cc04232.png)
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解题方法
4 . 已知各项都是正数的等比数列
的前3项和为21,且
,数列
中,
,若
是等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e714bab58ef7d55e9ea809d667e1df.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0939caf47d751f8c7139bd0b25fe98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22f4af06d11d85f30ed9821682ef7a82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5344eadd4711db34e3f935aedd5fb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e714bab58ef7d55e9ea809d667e1df.png)
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5 . 在等差数列
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017280e1d8c7bac0b8d06cd473f6a059.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37678b5a11cdd20e1523d54e720ad773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017280e1d8c7bac0b8d06cd473f6a059.png)
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2024-04-22更新
|
372次组卷
|
3卷引用:青海省部分学校2023-2024学年高三下学期联考模拟预测理科数学试题
名校
6 . 已知等比数列
的前
项和为
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4b54b4dcff4babbd36adaf46ee1110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
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2024-04-19更新
|
611次组卷
|
5卷引用:青海省西宁市第十四中学2023-2024学年高二下学期期中考试数学试卷
青海省西宁市第十四中学2023-2024学年高二下学期期中考试数学试卷河南省南阳市六校联考2023-2024学年高二下学期4月期中考试数学试题(已下线)模块一专题1《数列基础、等差数列和等比数列》单元检测篇A基础卷(高二人教B版)(已下线)模块一 专题2《数列基础、等差数列和等比数列》单元检测篇A基础卷(高二北师大版)(已下线)河南省南阳市六校联考2023-2024学年高二下学期4月期中考试数学试题变式题11-15
名校
解题方法
7 . 已知数列
的前n项和为
,且
,
,若对任意的正整数n,不等式
恒成立,则
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9368279ca7c18c03f2ef5ab1e89e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c116e0258980566aa652c099f382d6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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8 . 大衍数列,来源于《乾坤谱》中对《易传》“大衍之数五十”的推论,主要用于解释中国传统文化中的太极衍生原理.大衍数列中的每一项都代表太极衍生过程中,曾经经历过的两仪数量的总和.大衍数列从第一项起依次为 0,2,4,8,12,18,24,32,40,50,….记大衍数列
的通项公式为
,若
,则数列
的前30项和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b5e75a9c9d19bae25c92dc48e31588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b7adab471d41ac1b0451f07ab94aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
2024-03-12更新
|
1171次组卷
|
7卷引用:青海省海南州贵德高级中学2024届高三七模(开学考试)数学(理科)试题
名校
9 . 在等比数列
中,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b75f3bbbd06d46bf88fbf51ac6058c75.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2c4145619384fe32989276d217133b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9249ff00a6b08cd67f872ed11405cd52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b75f3bbbd06d46bf88fbf51ac6058c75.png)
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解题方法
10 . 任意
,有
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48402431243ccf5e7e01edd64a0b8c3.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7368766dc6206018032c846a0b7ac91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc495172f6a0522ccd4f8d5122e6423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48402431243ccf5e7e01edd64a0b8c3.png)
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