1 . 如图
中,
,
,
、
分别是
、
的中点,将
沿
折起连结
、
,得到多面体
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/fb92d19a-55eb-40ed-83ba-fd62541bca57.png?resizew=187)
(1)证明:在多面体
中,
;
(2)在多面体
中,当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70cb8fa2705eefbfdac611e7c8cce9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4918cecca87d8cec3d9df6153122fe2d.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e3a43d0fa18f6c0888ba804d5b329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/fb92d19a-55eb-40ed-83ba-fd62541bca57.png?resizew=187)
(1)证明:在多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e3a43d0fa18f6c0888ba804d5b329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90197a948331e61db644266368017e3.png)
(2)在多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e3a43d0fa18f6c0888ba804d5b329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85aeab3aeaf4367b711da8cde2e8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d07f36efcb9d203267d7c0409720cf.png)
您最近一年使用:0次
名校
解题方法
2 . 以下四个命题:
①若
为假命题,则p,q均为假命题;
②对于命题
则p为:
;
③
是函数
在区间
上为增函数的充分不必要条件;
④
为偶函数的充要条件是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4edb1714c9e1e5739efd858710c53bf0.png)
其中真命题的个数是( )
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
②对于命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708939264bbf4d9dc1e73c03a12a1e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99da3c3793d027a7d1203f88453e9cbe.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a04546d92fd165fc1ad2cc82c2dbb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1fce155963060b2e5b9147a185897cc.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55838863eacaec3c4f56df61169488d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4edb1714c9e1e5739efd858710c53bf0.png)
其中真命题的个数是( )
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
2020-06-16更新
|
421次组卷
|
5卷引用:广东省梅州市2020届高三下学期总复习质检数学(理)试题
广东省梅州市2020届高三下学期总复习质检数学(理)试题湖南省衡阳市第八中学2020届高三下学期高考适应性考试理科数学试题(已下线)第02练 常用逻辑用语-2021年高考数学(文)一轮复习小题必刷(已下线)专题01 集合与常用逻辑用语-备战2021年新高考数学纠错笔记广西南宁三中2019-2020学年下学期高二期末考试(重点班)文科数学试题
解题方法
3 . 如图,矩形
中,
,
,
为
的中点.把
沿
翻折,使得平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/17699c64-7e4a-4520-bbbf-5e257ec04b36.png?resizew=249)
(Ⅰ)求证:
;
(Ⅱ)求
所在直线与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/17699c64-7e4a-4520-bbbf-5e257ec04b36.png?resizew=249)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4151e948feebdf7b91fbe739feafa9bc.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678b28fddb166d90878d24d6e5481080.png)
您最近一年使用:0次
2020-06-08更新
|
1388次组卷
|
4卷引用:广东省梅州市2021届高三一模数学试题
解题方法
4 . 在平面直角坐标系
中,设
,过点
的直线
与圆
相切,且与抛物线
相交于
两点.
(1)当
在区间
上变动时,求
中点的轨迹;
(2)设抛物线焦点为
,求
的周长(用
表示),并写出
时该周长的具体取值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8670237d792cb26049c62f943bd012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b67c623950b5795d5fb4daeb8102a8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032b0daa56d9d542348861f6fc019b21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8414e0590b619bab4f9b37d154463a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb49dbba01c4ff5f686ffc8828351b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)设抛物线焦点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
您最近一年使用:0次
2020-04-14更新
|
277次组卷
|
3卷引用:2020届广东省梅州市高三高考一模数学(理)试题
解题方法
5 . 如图,在正四棱锥
中,
,
,
为
上的四等分点,即
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/cef80de8-38d1-43f9-888c-c2db96b5a0af.png?resizew=134)
(1)证明:平面
平面
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799eb4b34586b807b0042aaa57ac5b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c40a54efbaf9506bef09f841458124.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/cef80de8-38d1-43f9-888c-c2db96b5a0af.png?resizew=134)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec89c4d9a43c9d4f7e0ddcfe0a9360b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
您最近一年使用:0次
2020-04-14更新
|
473次组卷
|
4卷引用:2020届广东省梅州市高三高考一模数学(理)试题
(已下线)2020届广东省梅州市高三高考一模数学(理)试题2020届广东省梅州市高三总复习质检(5月)数学(理)试题2020届京师AI联考高三质量联合测评(二)理科数学(A卷)试题安徽省名校联考2022届高三下学期教育教学质量监控理科数学试题
6 . 已知曲线
,点
,
在曲线
上,且以
为直径的圆的方程是
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a305b6d1953de92339c8e9999dfed9f.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90037b49d0338c5370e31dd957a02f87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
您最近一年使用:0次
名校
解题方法
7 . 已知椭圆
的焦点分别为
,
,其中焦点
与抛物线
的焦点重合,且椭圆与抛物线的两个交点连线正好过点
,则椭圆的离心率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-04-14更新
|
516次组卷
|
4卷引用:2020届广东省梅州市高三高考一模数学(理)试题
(已下线)2020届广东省梅州市高三高考一模数学(理)试题2020届广东省梅州市高三总复习质检(5月)数学(理)试题2020届京师AI联考高三质量联合测评(二)理科数学(A卷)试题广东省广州市天河区天河中学2020-2021学年高二上学期第二次月考数学试题
名校
8 . 设
,则“
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e36c9c91220b0f2cbd4a48e8fa90e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27800680784ed78ad598aeeb253928d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7febfe7604d5125e9446cb4005654471.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分又不必要条件 |
您最近一年使用:0次
2020-02-29更新
|
1307次组卷
|
10卷引用:广东省梅州市梅江区梅州中学2024届高三下学期5月高考仿真考试数学试题
广东省梅州市梅江区梅州中学2024届高三下学期5月高考仿真考试数学试题2020届江苏省如皋、如东高三上学期期中数学试题八省八校(T8联考)2022届高三上学期第一次联考数学试题甘肃省张掖市2021-2022学年高三第二次全市联考(3月)理科数学试题华师一附中等T8联考2021-2022学年高三上学期第一次联考数学试题甘肃省武威市凉州区2021-2022学年高二上学期期末考试数学(理)试题广西贺州市钟山县钟山中学2020--2021学年高二上学期第三次月考理科数学试题广西贺州市钟山县钟山中学2020--2021学年高二上学期第三次月考文科数学试题山东省枣庄市第八中学2022-2023学年高一下学期3月月考数学试题四川省射洪中学校2022-2023学年高二下学期第二次半月考强基班(理科)数学试题
名校
解题方法
9 . 已知两动圆
和
(
),把它们的公共点的轨迹记为曲线
,若曲线
与
轴的正半轴的交点为
,且曲线
上的相异两点
满足:
.
(1)求曲线
的轨迹方程;
(2)证明直线
恒经过一定点,并求此定点的坐标;
(3)求
面积
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd06e4324534a5bf676dd16502d51628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca514aee77eb5f64a124add2362022f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d71b28f2d6b07c5323a10c5195a49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7625d648c8bd1c8d84cc044827e59638.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)证明直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
您最近一年使用:0次
2019-08-17更新
|
2995次组卷
|
10卷引用:广东省梅州市2020届高三下学期总复习质检数学(理)试题
广东省梅州市2020届高三下学期总复习质检数学(理)试题2015届上海市闵行区高三下学期质量调研考试(二模)理科数学试卷2016届河南省洛阳市一中高三下学期第二次模拟理科数学试卷上海市育才中学2018-2019学年高三下学期三模数学试卷上海市上海师范大学附属中学2018-2019学年高三下学期质量检测数学试题上海市向明中学2017-2018学年高三上学期期中数学试题广东省深圳市宝安中学(集团)2019-2020学年高三下学期2月月考数学(理)试题(已下线)数学-6月大数据精选模拟卷05(上海卷)(满分冲刺篇)(已下线)重难点06 解析几何-2021年高考数学【热点·重点·难点】专练(上海专用)上海市大同中学2017届高三上学期期中数学试题
解题方法
10 . 已知过定点
的动圆是
与圆
相内切.
(1)求动圆圆心
的轨迹方程;
(2)设动圆圆心
的轨迹为曲线
,
是曲线
上的两点,线段
的垂直平分线过点
,求
面积的最大值(
是坐标原点).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71fb572a6f07dcade5332bea766020f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfec9ae011bba2bfcf7d8ae9d079ac18.png)
(1)求动圆圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)设动圆圆心
![](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/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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