1 . 如图,在三棱锥P-ABC中,
,
,
平面PAB,D,E分别是AC,BC上的点,且
平面PAB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/1995a7a2-5ec0-44a1-b8e0-7d86cdec1c9d.png?resizew=242)
(1)求证
平面PDE;
(2)若D为线段AC中点,求直线PC与平面PDE所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23848b4957209461233d35671773e89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/1995a7a2-5ec0-44a1-b8e0-7d86cdec1c9d.png?resizew=242)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307807ee10071bafbe922eb18d2517d7.png)
(2)若D为线段AC中点,求直线PC与平面PDE所成角的正弦值.
您最近一年使用:0次
2 . 如图,在四棱锥
中,
平面
,
是正方形,
是
中点,点
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/5632ee9f-5143-492f-ba63-10f0f736f2ca.png?resizew=198)
(1)证明
平面
;
(2)若
,求平面
与平面
所成二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4f947e0f238c37854afa0bf6b93a8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/5632ee9f-5143-492f-ba63-10f0f736f2ca.png?resizew=198)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b37cff3ef72ff9386cebea4f2792bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
您最近一年使用:0次
2020-03-20更新
|
301次组卷
|
2卷引用:2020届新疆乌鲁木齐地区高三年级第一次质量监测理科数学试题
3 . 如图1,在梯形ABCD中,
,
,
,过A,B分别作CD的垂线,垂足分别为E,F,已知
,
,将梯形ABCD沿AE,BF同侧折起,使得平面
平面ABFE,平面
平面BCF,得到图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/9ddce68d-b2a1-4fe9-9cf3-51bda93d81de.png?resizew=319)
(1)证明:
平面ACD;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d782bc4aad7cf35baa3de7b8ea73e41f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/9ddce68d-b2a1-4fe9-9cf3-51bda93d81de.png?resizew=319)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c83d44cb6b68e558952d40b2f1de15.png)
您最近一年使用:0次
4 . 如图,在四棱锥
中,底面
是菱形,
平面
,且
,点
,
分别是
和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/dc97f9da-be6f-420e-928c-912510447827.png?resizew=222)
(Ⅰ)求证
平面
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdf3b093c42cd20c819e0d7ea93f3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/dc97f9da-be6f-420e-928c-912510447827.png?resizew=222)
(Ⅰ)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864689852707154e3a9be79f657f16d4.png)
您最近一年使用:0次
2019-03-19更新
|
408次组卷
|
2卷引用:【市级联考】新疆乌鲁木齐市2019届高三第二次诊断性测试数学(理)试题
5 . 已知
是椭圆
的右焦点,过点
的直线交椭圆于
两点.
是
的中点,直线
与直线
交于点
.
(Ⅰ)求证:
;
(Ⅱ)求四边形
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271e595c257e4c0ade90a9bbbf0e6b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57578d58a051ec128f76a48b41091b31.png)
(Ⅱ)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22bca838bac6ba107da9c05705e93bc.png)
您最近一年使用:0次
2019-05-12更新
|
969次组卷
|
3卷引用:【市级联考】新疆乌鲁木齐地区2019届高三第三次质量检测(文)数学试题
【市级联考】新疆乌鲁木齐地区2019届高三第三次质量检测(文)数学试题2019届新疆乌鲁木齐地区高三第三次质量检测数学(理)试题(已下线)专题08 解析几何中的最值范围问题(第五篇)-备战2020年高考数学大题精做之解答题题型全覆盖
6 . 已知拋物线C:
经过点
,其焦点为F,M为抛物线上除了原点外的任一点,过M的直线l与x轴、y轴分别交于A,B两点.
Ⅰ
求抛物线C的方程以及焦点坐标;
Ⅱ
若
与
的面积相等,证明直线l与抛物线C相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940349e98dc700cb6e196879c1a5ad72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e15e83c607c1c733d34df1f52e40d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8858a6a17aab0404023a9fa2ae9a5e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afac6934256a23613443c393446881a4.png)
您最近一年使用:0次
2019-04-16更新
|
826次组卷
|
4卷引用:【市级联考】新疆乌鲁木齐2019届高三第二次质量检测文科数学试题
【市级联考】新疆乌鲁木齐2019届高三第二次质量检测文科数学试题【市级联考】新疆乌鲁木齐地区2019届高三第二次质量监测数学(理)试题2019届新疆乌鲁木齐地区高三第二次质量监测数学(文)试题(已下线)湖南省株洲市2023届高三下学期一模数学试题变式题17-22
7 . 如图,在四棱锥
中,底面ABCD是边长为2的菱形,
,
,M为PD的中点,E为AM的中点,点F在线段PB上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/9de64bed-b446-46bc-b731-159eb2b071a9.png?resizew=193)
Ⅰ
求证
平面ABCD;
Ⅱ
若平面
底面ABCD,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e4e8e584fe063630a959e21673155e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16bb7dbd88c296dada33f7762aaf9298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebd38be3024e7e7649d603a2831c2e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/9de64bed-b446-46bc-b731-159eb2b071a9.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073a88b42836fb88433679932b48ad03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2203f54a88b26847f30df5b29aa4a763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39eadad1f7e05071e19fdd1d114b387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6750d9f532dabdefcb48ccaaf7352f0e.png)
您最近一年使用:0次
2019-04-17更新
|
547次组卷
|
2卷引用:【市级联考】新疆乌鲁木齐2019届高三第二次质量检测文科数学试题
8 . 如图,在四棱锥
中,底面ABCD为平行四边形,PA⊥底面ABCD,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/9b2fade9-da70-4db0-a0ee-7d3479602310.png?resizew=164)
(1)求证:平面PCA⊥平面PCD;
(2)设E为侧棱PC上的一点,若直线BE与底面ABCD所成的角为45°,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e713f0ba80e87438cf6273fb00cb81a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/9b2fade9-da70-4db0-a0ee-7d3479602310.png?resizew=164)
(1)求证:平面PCA⊥平面PCD;
(2)设E为侧棱PC上的一点,若直线BE与底面ABCD所成的角为45°,求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/816b7f285cc55bbe5bf873538ba87230.png)
您最近一年使用:0次
2019-03-15更新
|
1367次组卷
|
11卷引用:新疆2020届高三高考数学(理科)二模试题
新疆2020届高三高考数学(理科)二模试题【市级联考】山东省济宁市2019届高三第一次模拟考试数学(理)试题【全国百强校】内蒙古赤峰二中2018-2019学年高二4月月考数学(理)试题江西省宜春市上高二中2019-2020学年高三上学期第一次月考数学(理)试题辽宁省辽河油田第二高级中学2020-2021学年高二10月月考数学试题江西省奉新县第一中学2020-2021学年高二上学期第二次月考数学(理)试题江西省南康中学2020-2021学年度高二上学期第三次大考数学(理科)试题辽宁省丹东市凤城市第一中学2021-2022学年高二上学期10月月考数学试题河南省重点高中2021-2022学年高二上学期阶段性调研联考一理科数学试题河南省重点高中2021-2022学年高二上学期阶段性调研联考二理科数学试题河南省周口市周口恒大中学2023-2024学年高二上学期期中数学试题
9 . 在平面直角坐标系
中,
是
轴上的动点,且
, 过点
分别作斜率为
,
的两条直线交于点
,设点
的轨迹为曲线
.
(1)求曲线
的方程;
(2)过点
的两条直线分别交曲线
于点
和
,且
,求证直线
的斜率为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad57e3727b7bbd795b05332fbf9649e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13171541edecf3480703d0f9d44abf76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad57e3727b7bbd795b05332fbf9649e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9c6fe12d3a9727e00ef87a630302ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16c8ef3313ebed3434f6a7b61cdd93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682073fb0f79192098c287bed5b9b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80982c92734079de9d62bcf9511f1889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc96ce462f6a456c6993588e8edb0af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a14895e4d42943e5a87ba078dd8268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
您最近一年使用:0次
2018-08-01更新
|
576次组卷
|
3卷引用:2017届新疆乌鲁木齐市高三下学期第三次诊断性测验(三模)数学(理)试卷
2017届新疆乌鲁木齐市高三下学期第三次诊断性测验(三模)数学(理)试卷【全国百强校】河北省武邑中学2018届高三下学期第五次模拟考试数学(理)试题(已下线)必刷卷04-2021年高考数学(文)考前信息必刷卷(新课标卷)
2010·福建南平·一模
10 . 如图,在三棱锥
中, 侧面
与侧面
均为等边三角形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f809f9d492d97cb06e49af3a5d36ab.png)
为
中点.
(Ⅰ)证明:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f390394bb231e1d0c4708976b4b370.png)
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f809f9d492d97cb06e49af3a5d36ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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(Ⅰ)证明:
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(Ⅱ)求二面角
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2019-01-30更新
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20卷引用:2011届新疆农七师高级中学高三第二次模拟考试数学理卷
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