解题方法
1 . 已知
是递增的等比数列,
是方程
的根.
(I)求
的通项公式;
(II)求数列
的前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14877bf6d7297f02feff3468abf01f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02bc85419a13c4edb085384e84bcb556.png)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(II)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da48cb02b05c93e2e4091e868e32f07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解题方法
2 . 已知
是公差不为
的等差数列,
,且
依次成等比数列.
(I)求
的通项公式;
(II)设
的前
项和为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c9bd0eb8aeaf86ee27f809b60699c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ad6b9e7f1c2c4a5a3025ba57e71b1.png)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(II)设
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
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2021-01-18更新
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2卷引用:海南省2020-2021学年高二上学期期末考试数学试题
解题方法
3 . 在条件①和②中任选一个填到下面的横线上,并解答.
在
中,角A,B,C所对的边分别为a,b,c,已知
,______,求
和
的面积.
条件①:
,
;条件②:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eba77783b1b61d0c95b3901e962268c.png)
注:如果选择两个条件分别解答,则按第一个解答计分.
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e15cbd7c42d7b15d7ba8d2b28ab8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea99e6b51b8c3c3f24b1e908545ec653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c765c5a991982ac4b939ebc98237ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb75557d217f59ef1f33e8da1ac0d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eba77783b1b61d0c95b3901e962268c.png)
注:如果选择两个条件分别解答,则按第一个解答计分.
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4 . 下列从左到右排列的图形中,小正方形个数构成的数列的一个通项公式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://img.xkw.com/dksih/QBM/2021/1/16/2637495813144576/2638774660898816/STEM/b2630096-0848-4248-9034-3871208c63bb.png?resizew=398)
您最近一年使用:0次
2021-01-18更新
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263次组卷
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2卷引用:海南省2020-2021学年高二上学期期末考试数学试题
5 . 设等比数列
的前n项和为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
______ .
![](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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7961605fa4f2c480c67eed1d9e5b43ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
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6 . 满足下列条件的数列
是递增数列的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115da54f93de5e89d1e7f443fccb61f8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4卷引用:海南省2020-2021学年高二上学期期末考试数学试题
海南省2020-2021学年高二上学期期末考试数学试题第07讲 第四章 数列(章末检测)-【帮课堂】2021-2022学年高二数学同步精品讲义(人教A版2019选择性必修第二册)安徽省合肥市普通高中联盟2023-2024学年高二上学期1月期末联考数学试题(已下线)专题7.9 数列的函数性质—单调性与周期性(小题)-2022届高三数学一轮复习精讲精练
7 . 已知
是等差数列,且
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0748c346ed88f98e424de8edf278325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13efb0dfa8a1c27afdd173b76f004ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa37e5661af68b263a3ed9030d4e9003.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
8 . 在
中,已知
,解三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f6ca5d5a0d3645fb7377c4426b18814.png)
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3卷引用:海南省万宁市民族中学2019-2020学年度高二年级上学期期末试卷数学学科试题
海南省万宁市民族中学2019-2020学年度高二年级上学期期末试卷数学学科试题甘肃省金昌市永昌县第一高级中学2020-2021学年高一下学期期中数学试题(已下线)第20讲 期末复习(练习)基础卷-【教育机构专用】2021年春季高一数学辅导讲义(沪教版2020必修第二册)
9 . 解下列不等式
(1)
;
(2)
;
(3)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33be93876c101d3ccad337220ae50d22.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d48e62957aac3f5fe472bc437c2245e.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af7737aad7c1b662d3b483fc6c94cba0.png)
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10 . 已知
中,
,则
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6da0b98277843d1404e3feac5ac95a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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