名校
解题方法
1 . 如下图所示,四棱锥
中,
底面
,
,
为
的中点,底面四边形
满足
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/3a55247c-ae02-4c77-8a83-648aea9d3c64.png?resizew=161)
(Ⅰ)求证:平面
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/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9a31b4fce9307e48458fa5ce44779c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70c0e9d65544456c8767f851a658088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/3a55247c-ae02-4c77-8a83-648aea9d3c64.png?resizew=161)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac48b9ac8efbf41d6ab5242d247bd89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a49de08c6527101927582945d6551bf.png)
您最近一年使用:0次
2 . 如图,在四棱锥
中,底面
为直角梯形,
,
,
,
,点
在线段
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/7ca4b9ec-0c16-4e6a-8797-b3a586cb1a0d.png?resizew=168)
(1)证明:
平面
;
(2)当平面
平面
时,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/d5acb763021bf166ca719d07223591d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a398397362a18da1cc9f24bf3f356ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/465ed34f917b2ee5a42843b954155dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8acb66ffba1f80d9f34bce0031cab89.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/7ca4b9ec-0c16-4e6a-8797-b3a586cb1a0d.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f70cf3f6c7acbf60d4a4ca0ce89619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)当平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6a0cee8226e82cc57916e10d533369.png)
您最近一年使用:0次
2021-01-19更新
|
84次组卷
|
2卷引用:甘肃省天水市甘谷县第四中学2020-2021学年高三上学期第五次检测数学(理)试题
名校
3 . 如图,菱形
的对角线
与
交于点
,
,
,将
沿
折到
的位置使得
.
![](https://img.xkw.com/dksih/QBM/2020/12/20/2618503122452480/2620245407645696/STEM/0b073e75-d8e2-4a6a-b56b-2135a073ff76.png)
(1)证明:
.
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71e6ea7333dbc78d0a7b9bc3892f940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fc6a5e71fa379d613ac1ef1cdf1048.png)
![](https://img.xkw.com/dksih/QBM/2020/12/20/2618503122452480/2620245407645696/STEM/0b073e75-d8e2-4a6a-b56b-2135a073ff76.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbd1316b9d1f0c1e71fd078deec61f6.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2020-12-23更新
|
1412次组卷
|
10卷引用:甘肃省天水市第一中学2020-2021学年高三第八次模拟数学(理)试题
甘肃省天水市第一中学2020-2021学年高三第八次模拟数学(理)试题陕西省部分重点高中2020-2021学年高三上学期12月联考理科数学试题贵州省贵阳市、黔东南州部分重点高中2021届高三年级联合考试数学(理科)试题河北省2021届高三上学期12月月考数学试题湖南省联合体2020-2021学年高三上学期12月联考数学试题山东省日照市2021届高三下学期一模数学试题青海省海东市2021届高三上学期第二次模拟考试数学(理)试题广东省梅州市蕉岭中学等三校2020-2021学年高二下学期联考数学试题江苏省常州市前黄高级中学2021-2022学年高三上学期期初数学试题湖湘名校教育联合体2022-2023学年高三上学期9月大联考数学试题
2020高三·全国·专题练习
解题方法
4 . 已知点F为椭圆
(a>b>0)的一个焦点,点A为椭圆的右顶点,点B为椭圆的下顶点,椭圆上任意一点到点F距离的最大值为3,最小值为1.
(1)求椭圆的标准方程;
(2)若M、N在椭圆上但不在坐标轴上,且直线AM∥直线BN,直线AN、BM的斜率分别为k1和k2,求证:k1•k2=e2﹣1(e为椭圆的离心率).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392d61933568d27a27568c6298365bb.png)
(1)求椭圆的标准方程;
(2)若M、N在椭圆上但不在坐标轴上,且直线AM∥直线BN,直线AN、BM的斜率分别为k1和k2,求证:k1•k2=e2﹣1(e为椭圆的离心率).
您最近一年使用:0次
2020-04-30更新
|
482次组卷
|
5卷引用:2020届甘肃省兰州市高三诊断考试数学(理)试题
2020届甘肃省兰州市高三诊断考试数学(理)试题2020届甘肃省兰州市高三诊断考试数学(文)试题(已下线)理科数学-2020年高考押题预测卷03(新课标Ⅲ卷)《2020年高考押题预测卷》天津市南开区2020-2021学年高三上学期期末数学试题天津市培杰中学2022-2023学年高三上学期期末数学试题
5 . 已知抛物线
,点
,过点
的直线
与抛物线
交于
,
两个不同的点(均与点
不重合).
(1)记直线
,
的斜率分别为
,
,证明:
.
(2)若
,且
,
在
轴的两侧,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0241aa4e53623827cda67eee2363d55b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a1e412f7f66ff7d3f3e3fdb9e1ecc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/ac047e91852b91af639feec23a9598b2.png)
(1)记直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a0113fc5c23558ca283ac57949736d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856a321bab2001a8c39975d91455c0ed.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a11cb104b04c4e6a1be700e81da279a.png)
您最近一年使用:0次
2020-07-11更新
|
480次组卷
|
5卷引用:甘肃省民乐县第一中学2020届高三压轴考试数学(文)试题
名校
解题方法
6 . 已知椭圆
的离心率为
,直线
交
于
,
两点;当
时,
.
(1)求E的方程;
(2)设A在直线
上的射影为D,证明:直线
过定点,并求定点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a200ca2c4af794f4d1c6a5443830b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4300cdebb4dee5a135c5ed2b706b9cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae76c43c6ea0238bab230accd708ffef.png)
(1)求E的方程;
(2)设A在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
2020-10-11更新
|
576次组卷
|
4卷引用:甘肃省兰州市第五十中学2022-2023学年高三第一次模拟考试数学(理科)试题
甘肃省兰州市第五十中学2022-2023学年高三第一次模拟考试数学(理科)试题河北省唐山市2021届高三上学期第一次摸底数学试题(已下线)考点46 椭圆的概念、标准方程、几何性质(考点专练)-备战2021年新高考数学一轮复习考点微专题黑龙江省哈尔滨市第十三中学2022-2023学年高三下学期开学检测数学试题
名校
7 . 如图,三棱柱
的侧面
是边长为
的正方形,面
面
,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/19/2596487620116480/2597812554776576/STEM/93053e4164f64515b27e7e22ad96e37a.png?resizew=298)
(1)求证:
平面
;
(2)求点
到平面
的距离;
(3)在线段
上是否存在一点
,使二面角
为
,若存在,求
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986ba572d8373df48c996f8c8611498c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6480f384476190883f06c0289c7519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ca47585273d02911e4eb87f01c8354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d498a0467ff3c577a7ed175d7bffd885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650a59e187c0f9b854293bf316422a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2020/11/19/2596487620116480/2597812554776576/STEM/93053e4164f64515b27e7e22ad96e37a.png?resizew=298)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b46a7e819a5ed0b789f1f06bb0076422.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b46a7e819a5ed0b789f1f06bb0076422.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbbf91d6bac18e969cbb0015a16c9e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
2020-11-21更新
|
688次组卷
|
2卷引用:甘肃省平凉市庄浪县第一中学2021届高三上学期第四次模拟数学(理)试题
8 . 在三棱锥
中,
平面
,
为
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2020/6/28/2494654595997696/2494971011719168/STEM/cc2c39ba-5fd6-41a9-b420-71e6d6aabb48.png)
(1)证明:
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a3680ec97ccbb82b6e1ff78ac10b7c.png)
![](https://img.xkw.com/dksih/QBM/2020/6/28/2494654595997696/2494971011719168/STEM/cc2c39ba-5fd6-41a9-b420-71e6d6aabb48.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f56b8de4be02ed3a0c29e54fcfc49bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce81faef7c631553e02d7468973a74cd.png)
您最近一年使用:0次
2020-06-29更新
|
293次组卷
|
4卷引用:甘肃省陇南市6月联考2020届高三数学试卷(理科)
名校
9 . 如图,在三棱锥
中,
平面
,
为棱
上的一点,且
平面
.
![](https://img.xkw.com/dksih/QBM/2020/6/28/2494434136358912/2494935123247104/STEM/704182f9761949a3948251fe6fa23fae.png?resizew=168)
(1)证明:
;
(2)设
.
与平面
所成的角为
.求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://img.xkw.com/dksih/QBM/2020/6/28/2494434136358912/2494935123247104/STEM/704182f9761949a3948251fe6fa23fae.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e921f46d90e43f4517c55832b6280f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c20e88a33043f4279fff360c81006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd29cc627d76412c236aac6b29fa0fdf.png)
您最近一年使用:0次
2020-06-29更新
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841次组卷
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5卷引用:甘肃省静宁县第一中学2020届高三第十次模拟考试数学(理)试题
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10 . 如图,在直四棱柱ABCD﹣A1B1C1D1中,底面ABCD是矩形,A1D与AD1交于点E,AA1=AD=2AB=4.
![](https://img.xkw.com/dksih/QBM/2020/6/23/2490673496473600/2490894562910208/STEM/0d3c58b69ef64ca7aca195268bce2a5d.png?resizew=178)
(1)证明:AE⊥平面ECD.
(2)求直线A1C与平面EAC所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2020/6/23/2490673496473600/2490894562910208/STEM/0d3c58b69ef64ca7aca195268bce2a5d.png?resizew=178)
(1)证明:AE⊥平面ECD.
(2)求直线A1C与平面EAC所成角的正弦值.
您最近一年使用:0次
2020-06-23更新
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685次组卷
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14卷引用:【省级联考】甘肃省、青海省、宁夏回族自治区2019届高三5月联考数学(理)试题
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