名校
解题方法
1 . 在正方体
中.
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220499513712640/2221089699241984/STEM/d64269675fca4533a7deea17e368ce25.png?resizew=154)
(1)若
为棱
上的点,试确定点
的位置,使平面
;
(2)若
为
上的一动点,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4cf99a0d5833beacc3a0ee39d39458.png)
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220499513712640/2221089699241984/STEM/d64269675fca4533a7deea17e368ce25.png?resizew=154)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4ee628f1f5b2c224e4e9a759ffc305.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba8f7af0e091e082100c3cd7f8c487f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349740b9aa8c242258eb07cb7224c3f6.png)
您最近一年使用:0次
2016-12-03更新
|
817次组卷
|
2卷引用:2015-2016学年四川省雅安中学高二10月月考数学试卷
2 . 在如图所示的圆台中,
是下底面圆
的直径,
是上底面圆
的直径,
是圆台的一条母线.
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/d8dfa2d9ecab4a0bac28eb4cb0ea2d11.png)
(1)已知
分别为
的中点,求证:
;
(2)已知
,
,求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/c2026a00dac745a68d4be98ea57eb968.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/a994fec3fcf7465893f75c85217ef6ed.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/0417464253404fc491a1b3f2c534446d.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/315207c4cfdc43f487d79597ecc3af03.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/59ae6b20c1c44748857ac45f52020115.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/d8dfa2d9ecab4a0bac28eb4cb0ea2d11.png)
(1)已知
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/9421fba81f044da9927d1133821ca8b1.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/33636cafc63c46508c6d51a7dd3e22d5.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/3b5afd95420043b48d0f0b9ce314d996.png)
(2)已知
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/1018033148a743d9a84f8b7d80c4a7fa.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/c6d9212110084093b3757a8bc01a3f03.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573021933821952/1573021939400704/STEM/757b3eb9e96f4cf98b32ada934b17a44.png)
您最近一年使用:0次
12-13高一上·北京·期末
解题方法
3 . 在四棱锥
中,底面
是直角梯形,
,
,
,平面
平面
.
(1)求证:
平面
;
(2)求平面
和平面
所成二面角(小于
)的大小;
(3)在棱
上是否存在点
使得
平面
?若存在,求
的值;若不存在,请说明理由.
![](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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0073c8e806d0399a6983e163f0fd176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b489c25405ce48699d4f0a62820bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ba22238cdff318a4bd9d4d746b3229.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b505e0df1131e3a93fc81d13f6e224e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/fa4fd412-897c-4621-b148-dc248d6cc7a6.png?resizew=135)
您最近一年使用:0次
2016-12-02更新
|
651次组卷
|
5卷引用:2013届天津市天津一中高三第三次月考理科数学试卷
(已下线)2013届天津市天津一中高三第三次月考理科数学试卷(已下线)2011-2012学年北京市育园中学高一第一学期期末考试数学(已下线)2011-2012学年北京市海淀区高三上学期期末考试理科数学北京西城回民中学2018届高三上期中数学(理)试题北京市东城区2018届高三上学期期中考试数学试题
10-11高三·广东·阶段练习
解题方法
4 . 图为一简单几何体,其底面ABCD为正方形,
平面
,
,且
,
![](https://img.xkw.com/dksih/QBM/2011/3/11/1570037139185664/1570037144535040/STEM/7d70b4fb4df749eb8934013cd0fef93b.png?resizew=187)
(1)求证:
//平面
;
(2)若N为线段
的中点,求证:
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6b593f5b249e1a4aa013d493670bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7edfcd7a7efd029192202a021753ed5.png)
![](https://img.xkw.com/dksih/QBM/2011/3/11/1570037139185664/1570037144535040/STEM/7d70b4fb4df749eb8934013cd0fef93b.png?resizew=187)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564376a88fa74090de9f7694226a6184.png)
(2)若N为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa00966462971fe7856c033f8cb1b821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ca5b5fd1031438de2d2dd59be8c348.png)
您最近一年使用:0次
解题方法
5 . 如图所示,已知三棱柱
中,若
是棱
的中点,在棱
上是否存在一点
使
平面
?并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/18/1579005317308416/1579005317939200/STEM/f407eed13de5401bb2963db997db5530.png)
您最近一年使用:0次
2016-12-13更新
|
741次组卷
|
3卷引用:2016-2017学年山西省实验中学高二10月段测数学试卷
名校
6 . 如图所示,在等腰直角三角形
中,
,
为
的中点,点
在
上,且
,现沿
将
折起到
的位置,使
,点
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/6792a2f9-1671-43d3-9b28-bd1f5abebac0.png?resizew=231)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f558f13f554091c8f7be4378e8e85d6.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b51d3992644d37dc71c9b5a97d515c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4358de55076b62f301fd1f45b43f0bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22100e55aa168d2f2f66861184b6fe5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/6792a2f9-1671-43d3-9b28-bd1f5abebac0.png?resizew=231)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5edfe97aeab0cf16b40fa9d2e15f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ba93710d8baceb21a35970af05f81e.png)
您最近一年使用:0次
7 . 如图,菱形
的中心为O,四边形ODEF为矩形,平面ODEF⊥平面ABCD,DE=DA=DB=2
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/f21f1a63-c619-44be-9c22-e6ae8bcbbde4.png?resizew=414)
(1)若G为DC的中点,求证:EG//平面BCF;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/f21f1a63-c619-44be-9c22-e6ae8bcbbde4.png?resizew=414)
(1)若G为DC的中点,求证:EG//平面BCF;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2ee4d5eb7eef9da9703c7422227fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd03fcf55cebae42cad8103228a3922.png)
您最近一年使用:0次
8 . 如图,在直四棱柱ABCD-A1B1C1D1中,底面ABCD为等腰梯形,AB∥CD,AB=4,BC=CD=2,AA1=2,E,E1分别是棱AD,AA1的中点.
![](https://img.xkw.com/dksih/QBM/2016/11/23/1573168517840896/1573168524017664/STEM/9fc6451a3a80444aa6bc4092dd3b82d4.png?resizew=178)
(1)设F是棱AB的中点,证明:直线EE1∥平面FCC1;
(2)证明:平面D1AC⊥平面BB1C1C;
(3)求点D到平面D1AC的距离.
![](https://img.xkw.com/dksih/QBM/2016/11/23/1573168517840896/1573168524017664/STEM/9fc6451a3a80444aa6bc4092dd3b82d4.png?resizew=178)
(1)设F是棱AB的中点,证明:直线EE1∥平面FCC1;
(2)证明:平面D1AC⊥平面BB1C1C;
(3)求点D到平面D1AC的距离.
您最近一年使用:0次
2016-12-05更新
|
1395次组卷
|
2卷引用:2016-2017学年江苏徐州睢宁县古邳中学高二上第一次月考数学试卷
名校
解题方法
9 . 如图,已知四棱锥
中,底面
是平行四边形,
为侧棱
的中点.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
平面
;
(2)若
为侧棱
的中点,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.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/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466fabcaac59132fea648ff35342ec9d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
您最近一年使用:0次
解题方法
10 . 如图,在四棱锥
中,
平面
,
,
,点
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572961857257472/1572961863262208/STEM/c55d8b5d-6732-4164-bdcb-387be7fa8fc7.png?resizew=242)
(1)求证:
平面
;
(2)求证:平面
平面
.
![](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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef7ba7bd94c55dc1a5c056fea0368a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9ba90b720518d70eb4d365b2afaeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3251ed69ae80ade98e499e3e648a81af.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572961857257472/1572961863262208/STEM/c55d8b5d-6732-4164-bdcb-387be7fa8fc7.png?resizew=242)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac48b9ac8efbf41d6ab5242d247bd89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次