1 . 如图,在平行四边形
中,
,平面
平面
,且
.
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407361635631104/2408246925508608/STEM/a3adfa1f01dc47b7bd641a81ba05addc.png?resizew=172)
(1)在线段
上是否存在一点
,使
平面
,证明你的结论;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5acd37c075b9305086bb4e1bb66506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54cf75bbfc9db93d27937c8b8e977b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512bcdd5e3a0e23496f9c4904edd6058.png)
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407361635631104/2408246925508608/STEM/a3adfa1f01dc47b7bd641a81ba05addc.png?resizew=172)
(1)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871221c3eaabb6d9b030ce91c7139709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128c69eb81dae89c6989d06d20925ad2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f323421adf8083d252f0070f54f3a80.png)
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解题方法
2 . 已知椭圆
,
为椭圆
的右焦点,
为椭圆上一点,
的离心率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075ba8c6fb5ef7288cd3fed425c8e69e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/d0a71a8a-5397-4321-8b4b-b65c0605a510.png?resizew=189)
(1)求椭圆
的标准方程;
(2)斜率为
的直线
过点
交椭圆
于
两点,线段
的中垂线交
轴于点
,试探究
是否为定值,如果是,请求出该定值;如果不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0a9fa53090c853a0ebf4d5efecda4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075ba8c6fb5ef7288cd3fed425c8e69e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/d0a71a8a-5397-4321-8b4b-b65c0605a510.png?resizew=189)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)斜率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c987142aad34adcd31a6eefd6608d1c1.png)
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解题方法
3 . 已知双曲线
的一条渐近线经过圆
的圆心,则
的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50268b819f8ded010156844f9927a594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75c38eed680c837493bc9d22d375d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-02-27更新
|
363次组卷
|
3卷引用:2020届江西省赣州市高三上学期期末考试数学(文)试题
解题方法
4 . 已知抛物线y2=2x的焦点是F,点P是抛物线上的动点,又有点A(3,2),求|PA|+|PF|的最小值_______ .
您最近一年使用:0次
2020-03-17更新
|
386次组卷
|
3卷引用:江西省赣州市2018-2019学年度高二上学期期末文科数学试题
名校
解题方法
5 . 如图,在棱长为1的正方体AC1中,点E、F是棱BC、CC1的中点,P是底面ABCD上(含边界)一动点,满足A1P⊥EF,则线段A1P长度的取值范围是_______
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/cead1c35-703a-4cba-8791-7910f270425e.png?resizew=165)
您最近一年使用:0次
2020-03-17更新
|
306次组卷
|
3卷引用:江西省赣州市2018-2019学年度高二上学期期末文科数学试题
江西省赣州市2018-2019学年度高二上学期期末文科数学试题新疆维吾尔自治区喀什第六中学2022-2023学年高二上学期第一次月考数学试题(已下线)期中模拟预测卷01(测试范围:必修二前三章)-【满分全攻略】2022-2023学年高一数学下学期核心考点+重难点讲练与测试(人教A版2019必修第二册)
解题方法
6 . 已知双曲线C:
1(a>0,b>0)的左焦点为F,圆M的圈心在y轴正半轴,直径为a,若圆M与双曲线的两条渐近线相切且直线MF与双曲线的一条渐近线垂直,则该双曲线C的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c849bd2d30a190b8a8ca873058205ef9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 命题:
的否定是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075a3910458ac14d3f13f01e9b4cf1b1.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
您最近一年使用:0次
名校
8 . 已知命题p:m满足
,命题q:
,若p∨q为真,p∧q为假,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8dfa0fb563137866c79b5016318d035.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa6c175e0aa61a9317317a27cda8201.png)
您最近一年使用:0次
2020-03-17更新
|
246次组卷
|
2卷引用:江西省赣州市2018-2019学年度高二上学期期末文科数学试题
9 . 已知集合
,
,若“
”是“
”的充分不必要条件,则实数a的取值范围是_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138a56e9059230220a2fdb7c0c2bc44b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb05f0d8397ab6731310925d0899229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
您最近一年使用:0次
解题方法
10 . 在平面直角坐标系xOy内,点(
)在椭圆E:
(a>0,b>0),椭圆E的离心率为
,直线l过左焦点F且与椭圆E交于A、B两点
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/276d037e-66d9-42d4-865f-920721639c0b.png?resizew=183)
(1)求椭圆E的标准方程;
(2)若动直线l与x轴不重合,在x轴上是否存在定点P,使得PF始终平分∠APB?若存在,请求出点P的坐标:若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3dbec3b83d19038944f018b956cc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392d61933568d27a27568c6298365bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f78c38805c09dcfbcc42103308975a74.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/276d037e-66d9-42d4-865f-920721639c0b.png?resizew=183)
(1)求椭圆E的标准方程;
(2)若动直线l与x轴不重合,在x轴上是否存在定点P,使得PF始终平分∠APB?若存在,请求出点P的坐标:若不存在,请说明理由.
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