1 . 已知正项数列
的前
项和为
,
.
(1)记
,证明:数列
的前
项和
;
(2)若
,求证:数列
为等差数列,并求
的通项公式.
![](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/039e4fe671d61e59b96ee525c9df43e8.png)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf114725ab617af515bf9d2571402106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9928e46511e601913619a427ded84a3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e7e6e9c815b0716de4f5515e4370f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cbe66fe4e84b4022721122baab4a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2023-08-29更新
|
810次组卷
|
3卷引用:浙江省A9协作体2023-2024学年高三上学期暑假返校联考数学试题
2 . 已知等比数列
的公比
,且
,
是
,
的等差中项.
(1)求数列
的通项公式;
(2)证明:
,设
的前
项的和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9b03230cbcdbfb2f70cab2a306b717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ae2c13c6e6d0fd01e55c72129f337b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca324f309b9cd8cfc99e9c458b5ce59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.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/5a617582d1c65fd37666ab60a532f62d.png)
您最近一年使用:0次
2020-10-02更新
|
1022次组卷
|
8卷引用:浙江省金色联盟(百校联考)2020-2021学年高三上学期9月联考数学试题
浙江省金色联盟(百校联考)2020-2021学年高三上学期9月联考数学试题(已下线)专题18 等比数列——2020年高考数学母题题源解密(山东专版)(已下线)专题18 等比数列——2020年高考数学母题题源解密(海南专版)(已下线)考点41 等比数列及其前n项和-备战2021年新高考数学一轮复习考点一遍过(已下线)第四章 数列(章末测试)-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)(已下线)第四章 数列-2020-2021学年高二数学同步课堂帮帮帮(人教A版2019选择性必修第二册)人教B版(2019) 选修第三册 必杀技 第五章 素养检测(已下线)4.3.2 等比数列的前n项和公式(同步练习)-【一堂好课】2022-2023学年高二数学同步名师重点课堂(人教A版2019选择性必修第二册)
名校
解题方法
3 . 已知数列
满足
,
,
,
.
(1)证明:数列
为等差数列,并求数列
的通项公式;
(2)若
,记数列
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f4e1236d7dc0366d9523d0cbb426be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b039543372ce127c7b85782a118f0f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/452441c97433c6dee7d6a8dd4aaa7133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21051c2cb82f0cf87d005dc258ec9847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55e9df52276e2d89c646a0714bbee8f.png)
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2021-02-02更新
|
1516次组卷
|
7卷引用:浙江省嘉兴市2020-2021学年高三上学期期末数学试题
浙江省嘉兴市2020-2021学年高三上学期期末数学试题(已下线)【新东方】绍兴高中数学00034(已下线)专题24 数列(解答题)-2021年高考数学(理)二轮复习热点题型精选精练(已下线)专题22 数列(解答题)-2021年高考数学(文)二轮复习热点题型精选精练(已下线)专题23 数列(解答题)-2021年高考数学二轮复习热点题型精选精练(新高考地区专用)(已下线)【新东方】绍兴高中数学00038江苏省苏州中学2020-2021学年高二下学期期初质量评估数学试题
4 . 已知数列
满足
.
(1)求
,并猜想
的通项公式(不需证明);
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8657797864aa76ef43f70162d44b89.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe61d313eeca8ba47478a9de40540db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ffe6a85a1bede7b2ae93a20a2dea3c.png)
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5 . 如图,四棱锥P﹣ABCD的底面ABCD是正方形,PA⊥底面ABCD,E,F分别是AC,PB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/199b7b00-5683-468a-92b0-058142ca9096.png?resizew=144)
(1)证明:EF∥平面PCD;
(2)求证:面PBD⊥面PAC;
(3)若PA=AB,求PD与平面PAC所成角的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/199b7b00-5683-468a-92b0-058142ca9096.png?resizew=144)
(1)证明:EF∥平面PCD;
(2)求证:面PBD⊥面PAC;
(3)若PA=AB,求PD与平面PAC所成角的大小.
您最近一年使用:0次
6 . 已知函数
,记
,当
时,
.
(1)求证:
在
上为增函数;
(2)对于任意
,判断
在
上的单调性,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bc4f7ba817dca32178b65d9aab5c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ab7bb40f58f28c9799b20f91d15d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57bdb7eaab39ffa580415a3f0a17ce26.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ace630100e64ed290d82936ad249c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79fe3414b32bbd1190b41ed8307f905.png)
(2)对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61b4ceef651d43872a078d48092417d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79fe3414b32bbd1190b41ed8307f905.png)
您最近一年使用:0次
2019-10-15更新
|
294次组卷
|
6卷引用:专题6.6 数学归纳法 (练)-浙江版《2020年高考一轮复习讲练测》
(已下线)专题6.6 数学归纳法 (练)-浙江版《2020年高考一轮复习讲练测》江苏省南通市2018年高考数学模拟试题【市级联考】江苏省苏北四市2019届高三第一学期期末考试考前模拟数学试题(已下线)2019年12月11日《每日一题》一轮复习理数-数学归纳法(已下线)专题7.6 数学归纳法(练)-2021年新高考数学一轮复习讲练测(已下线)专题12 导数法巧解单调性问题-备战2022年高考数学一轮复习一网打尽之重点难点突破
7 . 已知数列
的首项![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66d7c5dae4d357a278bfd224144ee1f.png)
的前
项和为
.
(1)求证:数列
是等比数列,并求数列
的通项公式;
(2)证明:对任意的![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23aacab3c20b215a9616bc3434cc4e28.png)
(3)证明:
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572207888957440/1572207895076864/STEM/d0da94816c534be4a101db4c0e7e0bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66d7c5dae4d357a278bfd224144ee1f.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572207888957440/1572207895076864/STEM/d0da94816c534be4a101db4c0e7e0bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e06816992e1b854b5d4dae9a957b5e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)证明:对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23aacab3c20b215a9616bc3434cc4e28.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e37c8ff63c08973e2a5bb9fdc2a1cd7.png)
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2011·浙江·一模
8 . 数列
的前
项和为
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2e20fa9c136521f1a8588a68aba442.png)
(1)证明:数列
是等差数列,并求
;
(2)设
,求证:
.
![](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/4d2e20fa9c136521f1a8588a68aba442.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f543f3aafa4740bd65aefc8d8de4b6f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d04ed4a6aec6da13f5976612d7a841a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de284e39cfb3621ee94089d5d0bfe32.png)
您最近一年使用:0次
2011·辽宁沈阳·模拟预测
9 . 已知二次函数
和“伪二次函数”![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5a9b750094486e1eefebcd02c22eec.png)
(
、
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50f9c6eac4df8472e6a7446ebde7230.png)
),
(I)证明:只要
,无论
取何值,函数
在定义域内不可能总为增函数;
(II)在二次函数
图象上任意取不同两点
,线段
中点的横坐标为
,记直线
的斜率为
,
(i)求证:
;
(ii)对于“伪二次函数”
,是否有(i)同样的性质?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e73001005c51065ad1315be7a4175d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5a9b750094486e1eefebcd02c22eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb7dd8a018719c13d39eafdd39b59bd.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/d50f9c6eac4df8472e6a7446ebde7230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9173f81cce498276001b0285454972e0.png)
(I)证明:只要
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90bc334305133ac2b4b8d21efeb3324c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e03ad0c315806342d6cd732a0b91a3.png)
(II)在二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e73001005c51065ad1315be7a4175d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4daf40bad1cc89311930cce356672354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(i)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4268b18eccd4761ec42b59508b913e8.png)
(ii)对于“伪二次函数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d943bb3fbdc91b5097b7e34270e5c37.png)
您最近一年使用:0次
10 . 已知数列
中,
(实数a为常数),
,
是其前
项和,且
.数列
是等比数列,
,
恰为
与
的等比中项.
(Ⅰ)证明:数列
是等差数列;
(Ⅱ)求数列
的通项公式;
(Ⅲ)若
,当
时
,
的前
项和为
,求证:对任意
,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fab51121848ce166035ceab6f4e00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df945ccc3744817dc13ead49253f5fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385275d29d8c8a7841eaeaa3dfab2cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c493b9bf693aa7b9b964c488729256.png)
(Ⅰ)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1120926c7ec49540e3750e1986055da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/801c92175958685de7f846e159029f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f576db5f546030efda172e4c7e46be3.png)
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