1 . 已知数列
是公差不为0的等差数列,首项
,且
成等比数列.
(1)求数列
的通项公式;
(2)设数列
满足
,求数列
的前n项和
.
![](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/edcd9a1492c60152f2e32604cd519e72.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44e8d0669e5bb98993cb10e0e7899b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2020-10-16更新
|
875次组卷
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19卷引用:【全国百强校】宁夏银川一中2019届高三第二次月考数学(文)试题
【全国百强校】宁夏银川一中2019届高三第二次月考数学(文)试题【全国百强校】西藏林芝一中2019届高三上学期第二次月考数学(文)试题【全国百强校】湖南省衡阳市第八中学2019届高三第三次月考数学(文)试题宁夏中卫市海原县第一中学2019-2020学年高二上学期期末数学(文)试题天津市宝坻区大口屯高级中学2019-2020学年高二上学期第一次月考数学试题【全国百强校】甘肃省静宁县第一中学2019届高三上学期第三次模拟考试数学(文)试题【全国百强校】辽宁省沈阳市东北育才学校2019届高三第五次模拟数学(文)试题2019年黑龙江省东南联合体高二下学期期末考试数学(文)试题吉林省长春市第二十九中学2019-2020学年高一下学期线上检测数学试卷黑龙江省大庆第一中学2017届高三考前冲刺模拟数学(文)试题辽宁省沈阳市东北育才学校2018届高三上学期第一次模拟考试数学(文)试题贵州省贵阳市四校2021届高三上学期联合考试(一)数学(文)试题贵州省贵阳市四校2021届高三上学期联合考试(一)数学(理)试题辽宁省大连市普兰店市第三十八中学2020-2021学年高三上学期开学考试数学试题(已下线)拓展二 数列求和的方法(精练)-2020-2021学年一隅三反系列之高二数学新教材选择性必修第二册(人教A版)黑龙江省哈尔滨市第九中学校2021-2022学年高二上学期期末数学试题(已下线)数学-2022年高考押题预测卷01(江苏专用)甘肃省武威市天祝藏族自治县第一中学2022-2023学年高二上学期期末考试数学试题广西百色市2022-2023学年高二上学期期末教学质量调研测试数学试题
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解题方法
2 . 在平面直角坐标系
中,已知椭圆
的焦距为2,离心率为
,椭圆的右顶点为
.
(2)过点
作直线
交椭圆于两个不同点
,
,求证:直线
,
的斜率之和为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcba5c93bd4035937949aafa0c354106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
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2020-09-06更新
|
2293次组卷
|
12卷引用:宁夏石嘴山市第三中学2019-2020学年高三第四次高考适应性考试数学(理)试题
宁夏石嘴山市第三中学2019-2020学年高三第四次高考适应性考试数学(理)试题2020届江苏省南通市如东县栟茶高级中学高三上学期第三次月考数学试题【全国百强校】江西省抚州市金溪县第一中学2018-2019学年高二12月月考数学(文)试题【全国百强校】江西省南昌市第十中学2018-2019学年高二上学期第二次月考数学(文)试题广东省佛山市禅城区佛山第一中学2022届高三上学期10月月考数学试题河南省济源市第四中学2023-2024学年高二上学期12月考数学试卷2016-2017学年江苏苏锡常镇四市高三教学情况调研(一)数学试卷【全国市级联考】新疆维吾尔自治区乌鲁木齐地区2018届高三5月适应性训练数学(理)试题【全国市级联考】新疆乌鲁木齐地区2018届高三5月适应性训练数学文试题2020届重庆市北碚区高三上学期第一次诊断性考试数学试题人教A版(2019) 选择性必修第一册 第三章 圆锥曲线的方程 单元测试陕西省渭南市大荔县2020-2021学年高二上学期期末数学(理)试题
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3 . 已知
,求
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d1214652a7c488d1fe4ee7c44b49dd.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a7de5b70003502e40b95b3b7d3d933.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d1214652a7c488d1fe4ee7c44b49dd.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59919b3125f5a9216a2c8cb51f02151c.png)
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4 . 化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215e4e4490b52cb872dbf020309f10cc.png)
您最近一年使用:0次
名校
5 . 若
是方程
的两根,则
的值为多少.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0436ff4c817f257ea0b8a9e25854860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d45fafe8ec3a88ccf34e0b50ea17b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
6 . 已知一扇形的周长为4,当它的半径与圆心角取何值时,扇形的面积最大?最大值是多少?
您最近一年使用:0次
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7 .
的内角
、
、
的对边分别为
、
、
,已知
.
(1)求
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfb88fd450f5e11bcdd5642ed9f9ea6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8653af649d2a1b22f50c8529ef43136d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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8 . 已知
,
,满足
.
(1)将
表示为
的函数
,并求
的最小正周期;
(2)已知
、
、
分别为锐角
的三个内角
、
、
对应的边长,
的最大值是
,且
,求
周长
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf56c1ccbb65430a4fb1fa3160b88bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4874b040a00b2dd116177a8294d2b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45632b3ca6ab6c0b05df0d5a838c375.png)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7f04a0d543ab3f626b6fff5d2305f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba674cd992df5835d3a9d1caf0b50a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
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9 . 设向量
,
,
,角
,
,
分别为
的三个内角,若
在
处取得极值.
(1)试求
与
的值;
(2)当
,求
的最小外接圆半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6c61ccb09f0fec81174221562c6b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f934c278da8c7082a3614d16c271d523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e7b2150ed88d3ffdec3d142617eacf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadfd5e0495edcfbd6858e7b1fe95c07.png)
(1)试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e3d87be9f706832ef25537d78a201b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b786cd833bd3dd843ce8f28af1d08472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
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10 . 已知
,
. 对于函数
、
,若存在常数
,
,使得
,不等式
都成立,则称直线是
函数
与
的分界线.
(1)讨论函数
的单调性;
(2)当
时,试探究函数
与
是否存在“分界线”?若存在,求出分界线方程;若不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48a2591f4e2a75a71f92d9efb6ab331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6bdc310da162ebc3a8fbfbde8bbaec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a7afcf760aa4aff404eae3ad47afac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
您最近一年使用:0次