解题方法
1 . 已知椭圆
:
右焦点为
,
为椭圆上异于左右顶点
,
的一点,且
面积的最大值为
.
(Ⅰ)求椭圆
的标准方程;
(Ⅱ)若直线
与直线
交于点
,线段
的中点为
,证明直线
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be92f0e0012a7696c78e3e00513edefd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d52429c8324350309f77e7209a5c35.png)
(Ⅰ)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b53b86bd516400d6fa7dabb3603f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d4ab4f05dbd1a4301ed0dc4c73aa75.png)
您最近一年使用:0次
2020-06-20更新
|
541次组卷
|
4卷引用:新疆乌鲁木齐地区2020届高三年级第三次质量监测理科数学试题
2 . 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
解题方法
3 . 如图在正方体
中,
,
分别是
,
的中点,
,
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/cf2318a0-624b-42ef-adc5-77e82e737590.png?resizew=171)
(1)证明:直线
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/6e09725691ee7851f54c0dee86b2bf55.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6dff73feca9ef71afdaeb8a795d46fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/cf2318a0-624b-42ef-adc5-77e82e737590.png?resizew=171)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7db6f84e9bf0a9ddbb47a6a1761607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e389ea676222489b9bf1b33ba1baddf7.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e389ea676222489b9bf1b33ba1baddf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
4 . 已知点
,动点P到直线
的距离与动点P到点F的距离之比为
.
(1)求动点P的轨迹C的方程;
(2)过点F作任一直线交曲线C于A,B两点,过点F作AB的垂线交直线
于点N;求证:ON平分线段AB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092fd1b1d33979818300cd2e3699bff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)求动点P的轨迹C的方程;
(2)过点F作任一直线交曲线C于A,B两点,过点F作AB的垂线交直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
您最近一年使用:0次
2020-03-20更新
|
255次组卷
|
2卷引用:2019届新疆维吾尔自治区高三年级第三次毕业诊断及模拟测试理科数学试题
解题方法
5 . 如图,在四棱锥
中,四边形
为梯形,且AB
DC,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/4e9f54d7-9df7-4c57-b74a-04b4a8aad691.png?resizew=209)
(Ⅰ)证明:平面
平面
;
(Ⅱ)若
,
,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/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/4e9f54d7-9df7-4c57-b74a-04b4a8aad691.png?resizew=209)
(Ⅰ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ad6a0124359e8b9f7649cf0bff51ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f04579e4c69a5b6b895e0c44a94532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83c3f76bc7569c3c088da98bb3b2c50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
您最近一年使用:0次
2020-05-09更新
|
280次组卷
|
2卷引用:2020届新疆高三第一次模拟测试(问卷)数学(理科)试题
6 . 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
|
300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
7 . 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
8 . 如图,在四棱锥
中,底面
是正方形,
平面
,且
,点
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/725cef74-5146-4fd0-9650-eba152709436.png?resizew=163)
(1)求证:
平面
;
(2)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/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/725cef74-5146-4fd0-9650-eba152709436.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5102c216393e133fa25dba98cd78535.png)
您最近一年使用:0次
2019-11-21更新
|
1029次组卷
|
7卷引用:新疆维吾尔自治区乌鲁木齐市第一中学2023届高三第三次诊断性测试数学(理)试题
9 . 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
10 . 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