名校
解题方法
1 . 当
,且
时,我们把
叫做数列
的子数列.已知
为正项等比数列,且其公比为
.
(1)直接给出
与
的大小关系.
(2)是否存在这样的
满足:
成等比数列,且子数列
也成等比数列?若存在,请写出一组
的值;否则,请说明理由.
(3)若
,证明:当
,
时,有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc9e15cba1e06e8ecd151d233ecc4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ff2500b5484b40bb2ccec65979cba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f070544508ef8ab537b19ef069d5fe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e15be6eb86b5f1746b0036a87c9ca7.png)
(1)直接给出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddcc815a87e95af8100f0c2c7422d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)是否存在这样的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94299c635e889a3915aeb2b785419ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94299c635e889a3915aeb2b785419ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cee6526c7e1d9a04854271e135c9f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94299c635e889a3915aeb2b785419ce.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbc131b15e1df6cf64e65eb88e23042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699e55c211a6e091cc7a9d2cde3ed981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898062ebfccd4fca082aa8a9d79a094b.png)
您最近一年使用:0次
名校
解题方法
2 . 已知函数
,
.
(1)证明:
;
(2)求
时,函数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707dd66e0d6f8c33c6e05b4555f12c31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a2a3b7aa204bbbb7ce6bd6e90c2cce9.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9849587a15f11b9f9c33cf9420dbcea6.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02fe8bb92fa4b30acc824125d37efe31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28d42a4d0c016bc834dc5c11156d1b9.png)
您最近一年使用:0次
名校
3 . 已知圆
的直径
,
圆
所在平面,
,点
是圆周上不同于
、
的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/f1545863-8d2f-4ad2-84a5-ebb9446b7057.png?resizew=167)
(1)证明:
;
(2)已知
,点
是棱
上一点,若
与平面
所成角的余弦值为
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/f1545863-8d2f-4ad2-84a5-ebb9446b7057.png?resizew=167)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5148e7fc64ac3fed107192236f8e129d.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60870baa5e3fbc33a749aa5f0a94be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e699f6e1923284a5eecdc897bfbc2337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2023-01-18更新
|
425次组卷
|
3卷引用:河南省商丘市部分学校2022-2023学年高二上学期期末考试数学试题
解题方法
4 . 已知在
中,点
,
分别为
,
的中点.
(1)若
的面积为
,
,
且
为锐角,求
的长;
(2)若
,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58d16c9d123c7c778f7abc3c8331242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6fbcf04c452f0b183c4473bf440bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e520cef3cebf757a24737ffb661834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611b0ea4a4005cc50eaa68a6be62eda6.png)
您最近一年使用:0次
2021-11-15更新
|
140次组卷
|
2卷引用:河南省商丘市部分学校联考2021-2022学年高二上学期期中考试文科数学试题
解题方法
5 . 抛物线
:
的焦点为
,点
在直线
上,过
作
轴的垂线,交抛物线
于点
,直线
与
轴的交点为
,当点
的横坐标为
时,四边形
的周长为
.
(Ⅰ)求
的值;
(Ⅱ)过点
作抛物线
的切线,切点分别为
,
,证明:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6cee49406aca78a5bb7b57e86f57528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb70fdf064b9193e506ca43f4672af56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb70fdf064b9193e506ca43f4672af56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d527091d88ffaa9560d398bbf7b9744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a6d5add30526296ac2b5e9fea04b77.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(Ⅱ)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2021-06-22更新
|
267次组卷
|
2卷引用:河南省商丘市部分学校联考2020-2021学年高二下学期阶段性测试(五)理科数学试题