1 . 已知数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
,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/04c2864e2ec3416cc4c081ac1f71a0af.png)
![](https://img.xkw.com/dksih/QBM/2015/11/12/1572286717435904/1572286722785280/STEM/b543be71ddc44501af6297ac0a72ba7d.png?resizew=41)
![](https://img.xkw.com/dksih/QBM/2015/11/12/1572286717435904/1572286722785280/STEM/0110895f57754fab9ed8d2e5d3192992.png?resizew=19)
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2 . 已知等差数列
中,前10项的和等于前5项的和.若
则
( )
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987097657344/1571987103383552/STEM/7cfb5683ebe74203b12ee3ec072e1a72.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987097657344/1571987103383552/STEM/cd4322347eeb47f8b7e8bd950fa0b3f7.png?resizew=79)
![](https://img.xkw.com/dksih/QBM/2015/2/10/1571987097657344/1571987103383552/STEM/5c4a2d2ec093470d8b53804f578ad192.png?resizew=29)
A.10 | B.9 | C.2 | D.8 |
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3 . 已知
为等差数列
的前
项和,
,且
是
与
的等比数列.
(1)求数列
的通项公式;
(2)若
为整数,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f86a8746a583f411fb73c6334eb27b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9903b063c08d9d3ada396cf598cc21.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1abb93c7c3a3601d8dd986c8c7a1178e.png)
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2017-02-08更新
|
251次组卷
|
2卷引用:2017届河北磁县一中高三11月月考数学(理)试卷
2013·福建·一模
4 . 如图,矩形
的一边
在
轴上,另外两个顶点
在函数
的图象上.若点
的坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/758080793e3ca0b8166f840475434aa9.png)
且
,记矩形
的周长为
,则![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/c35eba4c51e24cf397c830c42de50eb6.png?resizew=127)
________________
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/303521406bd949c384a6b3bcfd52a47a.png?resizew=73)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/d9c72ccd52b146e5b0d201ff9d8e784e.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/8e55ecb9118c4cd9b45cc5735a3156f5.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/096c9cef9f084304b70a0809568600c4.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/d5a4db6821a644fb94d92a2222412385.png?resizew=132)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/e2a06ee26fbe4ab49bbc67e3e8fe0f67.png?resizew=20)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/758080793e3ca0b8166f840475434aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac1b27796cbb1a9ed712239399ac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8e3c9f6f00803d033d60ecc03be61a.png)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/aecbed12a00a4069879958b2c84193a2.png?resizew=72)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/f2ea724574dd411198fc2478c4812538.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/c35eba4c51e24cf397c830c42de50eb6.png?resizew=127)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1571235507347456/1571235512819712/STEM/ee00059f6f6e48db87eea1c80092b7d4.png?resizew=151)
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5 . 在
中,三个内角
的对边分别为
,若
,试问
是否成等差数列,若不成等差数列,请说明理由;若成等差数列,请给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/043714f337a44c343813c4e34f699211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
您最近一年使用:0次