解题方法
1 . 在数列
中,
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0686e6f576ed7062f30075bbbcbd034e.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf365a978e7afc667442c9d9677a764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e9bab4458b0d20baefc868960f1958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0686e6f576ed7062f30075bbbcbd034e.png)
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2 . 在等差数列
中,若
,则
的通项公式为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504f08b49ec6020e15f81a811eb32b8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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3 . 已知等差数列
中,
,则该数列的前
项和
的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b4ac9645fc8d23583a9cfe8a4ebd82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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名校
4 . 已知等差数列
中,
,
,若在数列
每相邻两项之间插入三个数,使得新数列也是一个等差数列,则新数列的第41项为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1928c254cfada1f75a5cd1e34db5a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e29b6d31d8d6e75388ae4304fce5258d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2024-03-15更新
|
309次组卷
|
2卷引用:湖南省长郡中学2023-2024学年高二下学期寒假检测(开学考试)数学试题
2024高三·江苏·专题练习
5 . 设等差数列
的前
项和为
,且
,
.则数列
的通项公式为___________ ;在任意相邻两项
和
之间插入
个1,使它们和原数列的项构成一个新的数列
,则数列
的前200项的和
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/c6012aa7aaa80c055bd14e8521ec8ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efc8e4aeb7d5f2e7fe689952aa50cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3808e0536f89b30cb3bc4e8886d5c9c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98aa5f1acb67ec4580d240c2525e4d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cb8cdacedeb2ec46a7d65e903a0ce1b.png)
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名校
解题方法
6 . 已知数列
是等差数列,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448a5ec46f38924bb11975f082bbd437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
您最近一年使用:0次
2024-03-12更新
|
499次组卷
|
3卷引用:上海市七宝中学2023-2024学年高二下学期3月月考数学试题
23-24高二下·全国·课前预习
7 . 在等差数列
中,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc0cd1b5a528a5719a29a6fa6996281.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd75147950f55840e8bb992805acc01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc0cd1b5a528a5719a29a6fa6996281.png)
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8 . 在等差数列![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
中.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4b6e0fbef6c6f88e753598e41ff023.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4f2fed3149b0d2ac1342f370dce98e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1203b8fc51a9c85b2d3b02b1a56e3b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4b6e0fbef6c6f88e753598e41ff023.png)
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解题方法
9 . 设等差数列
的前n项和为
﹐若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6d3d768cd00a21b3aca22aa64ac3c4.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3903653955c424d3f6135edc5b47e231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2111370b3a3b575b7cac52bec12395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6d3d768cd00a21b3aca22aa64ac3c4.png)
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10 . 我国度量衡的发展有着悠久的历史,战国时期就已经出现了类似于砝码的、用来测量物体质量的“环权”.已知9枚环权的质量(单位:铢)从小到大构成项数为9的数列
,该数列的前3项成等差数列,后7项成等比数列,且
,
,
,则数列
所有项的和为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac52eacb833a7a2d4c5d07340d2365d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d586fc54570182e0d36dd9f6d66095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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