1 . 如图,在四棱锥
中,平面
平面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
,在锐角
中
,并且
,
.
![](https://img.xkw.com/dksih/QBM/2015/5/27/1572114821300224/1572114826805248/STEM/0dfef42deca94a0296336667d9ecc7d9.png?resizew=169)
(1)点
是
上的一点,证明:平面
平面
;
(2)若
与平面
所成角为
,当面
平面
时,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58579094b5d753e9205c2ec89ca3ae07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e8d9bd81b063a824baf17d947db5ee.png)
![](https://img.xkw.com/dksih/QBM/2015/5/27/1572114821300224/1572114826805248/STEM/0dfef42deca94a0296336667d9ecc7d9.png?resizew=169)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fb16d2f0db758b8b7a8d3743143f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6fb16d2f0db758b8b7a8d3743143f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
真题
2 . 如图,四棱锥
中,底面是以
为中心的菱形,
底面
,
,
为
上一点,且
.
(1)求
的长;
(2)求二面角
的正弦值.
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/c2f70fe100034862ad6a8d5165d3db75.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/9874f5fd78824379bc461e831765222c.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/666341487fc24fe894dd5693b5423d70.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/c285cf021e4146ea9257c0acf215d626.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/5e24b055d96e44bfb1379179ae66437d.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/e8e14784d9d94c5298c601d73e447b85.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/a83d9b34c6924cca9a9813d7d0411cf1.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/0b2dbced52bc4937b20069a722f436af.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/542f6e6aab214cde92cb47df27649862.png)
(2)求二面角
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571784957353984/1571784963276800/STEM/e480f142b1dd41fd9ababe1b594f8627.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/c5a93352-2096-4256-abb2-0c6023565c6a.png?resizew=218)
您最近一年使用:0次
3 . 如图,正方体
的边长为2,
,
分别为
,
的中点,在五棱锥
中,
为棱
的中点,平面
与棱
,
分别交于
,
.
(1)求证:
;
(2)若
底面
,且
,求直线
与平面
所成角的大小,并求线段
的长.
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/5371d6860fdd4c2985d90e6d66f417e9.png?resizew=51)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/28cd28f95d1a4a8c9e4564a9c46f5494.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/dc1bbe151d8a4cf396fd7140673bc0ac.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/2ff003b0353e4b23bf3d9a2ba0d15a00.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/3dedf01b2202410ca2978591d0fdcf53.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/44bd1b7ce43d47c39fd54f6612882f46.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/7e2b053fdd614e27bc9c671105fe04ed.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/f2b9fc222e4b476eafcd71e15162bb5a.png?resizew=25)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/1e7ae17a1f9b4364a9e4d2a490f86ade.png?resizew=37)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/09be45b411f0462cb7dda26fb34062d3.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/1d0b9eb5054143c9adb640525fc34672.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/e675f5504f424e548dee9d57b7cdbaa9.png?resizew=19)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/c11885a458ab4031bf54ba9ae8adefc0.png?resizew=63)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/e1178bc8f1784c53a390fd9400c665ee.png?resizew=59)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b1a3078dc4803bd5e16833ddd459e0.png)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/fc7d94ecf9e3460182c1f7a229ba29f0.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/1e7ae17a1f9b4364a9e4d2a490f86ade.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571782625320960/1571782630924288/STEM/209e36a615a94c669b0e7eb2077439a3.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/97b7a5a2-ce3f-4f97-a65d-fc423673537e.png?resizew=182)
您最近一年使用:0次
2016-12-03更新
|
4333次组卷
|
2卷引用:2014年全国普通高等学校招生统一考试理科数学(北京卷)
2014·广东湛江·一模
名校
解题方法
4 . 在如图所示的几何体中,四边形
为平行四边形,
,
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571681095139328/1571681100988416/STEM/d2fd3c26c0c84c68ab2b1ec536cbb2ac.png?resizew=217)
(1)若
是线段
的中点,求证:
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41d3f7d55fcbaebc4e2450ac63a3dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c30de91ed42df92510cb64548fe704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05f315ab14567942f699983b60d04be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6034301fc4110da89bdb0f46ad82ab.png)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571681095139328/1571681100988416/STEM/d2fd3c26c0c84c68ab2b1ec536cbb2ac.png?resizew=217)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6895bdd0286b8e2704fee9c343d82f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9cd88984f891a49ab451a06410a1f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b820c84570da9c38d0a81c22788b76.png)
您最近一年使用:0次
2016-12-02更新
|
1477次组卷
|
3卷引用:2014届广东省湛江市高三高考模拟测试二理科数学试卷
(已下线)2014届广东省湛江市高三高考模拟测试二理科数学试卷宁夏银川唐徕回民中学2019-2020学年高二12月数学(理)试题甘肃省金昌市永昌县第一高级中学2020-2021学年高二上学期期末数学(理)试题
5 . 如图,四棱锥
的底面ABCD是平行四边形,
,
,
面
,设
为
中点,点
在线段
上且
.
(1)求证:
平面
;
(2)设二面角
的大小为
,若
,求
的长.
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/fbe2c93024cc4defbfd664d248c9f26b.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/dfbc51addab444a3a829a72863be52cd.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/882d788e0d574781b1594dc4601e5ec3.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/685c0c13d9b543ccb2abf857ba21f484.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/0f88a790965642b7bbd40dda123949cc.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/066cf30d2e9a4832ae21171d00faf2b5.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/31ca9d8f8e9b4da186f066541aa59eaf.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/29fd2392bfdb43eea30beb3d43441b56.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/17d0bfeb73964d6285dd9ccc81789d94.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/b3582d2246694bb6857ebdf05e0531a2.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/c61280d2722c4813b479568feb9fe407.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/d311c1e3123d4b8a80686aaf2c8c2b16.png)
(2)设二面角
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/8d05f983837848fa9266c355b68a62ec.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/deb1ec2b0dc944f5b9c7c266918e6e19.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/b391963284c348f493386694ee942773.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/47c7fdd31de043c5a115e358424e563a.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/d69f2e43a8ea4c0b901632955bcc2ed9.png)
您最近一年使用:0次
6 . 如图,四棱锥P-ABCD中,PA⊥平面ABCD,E为BD的中点,G为PD的中点,
,
,
,连接CE并延长交AD于F.
![](https://img.xkw.com/dksih/QBM/2014/5/22/1578311980425216/1578311980875776/STEM/9add0b5fac1d4e1aaed70bacac5509ba.png?resizew=189)
(1)求证:AD⊥平面CFG;
(2)求平面BCP与平面DCP的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7bee4046d91676e3da10a5ec6e5623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50fdeedd0afce923be9b9ad4227fcebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab58dfbc740745c55839f2f43c1886b.png)
![](https://img.xkw.com/dksih/QBM/2014/5/22/1578311980425216/1578311980875776/STEM/9add0b5fac1d4e1aaed70bacac5509ba.png?resizew=189)
(1)求证:AD⊥平面CFG;
(2)求平面BCP与平面DCP的夹角的余弦值.
您最近一年使用:0次
2016-12-12更新
|
3720次组卷
|
2卷引用:2013年普通高等学校招生全国统一考试理科数学(江西卷)
真题
解题方法
7 . 如图所示,在三棱锥
中,
平面
,
,
分别是
的中点,
,
与
交于
,
与
交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2013/7/18/1571294719934464/1571294725439488/STEM/6dd45b3e5ac447f3a7c3196078628f3f.png?resizew=327)
(Ⅰ)求证:
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c499b1f470978c4f8cc05ffdebc2e961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64484f96568410926e0c50898eba6e32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c83e50750b60551033b5a177167117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7da34d259c8c55cc033c4c833ec61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9a32fd1185bc9c1594123e0ff34da6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40454aa04533144f862c09680099018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://img.xkw.com/dksih/QBM/2013/7/18/1571294719934464/1571294725439488/STEM/6dd45b3e5ac447f3a7c3196078628f3f.png?resizew=327)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b75a1c6817507e7b15a2e4903e317a6.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20703ca7984a80e59d711b8283ee8aa.png)
您最近一年使用:0次
2016-12-02更新
|
3009次组卷
|
7卷引用:2013年全国普通高等学校招生统一考试理科数学(山东卷)
2013年全国普通高等学校招生统一考试理科数学(山东卷)2020年全国普通高等学校统一招生考试试验检测卷2数学(文科)试题2020年全国普通高等学校统一招生考试试验检测卷2数学(理科)试题人教A版(2019) 选择性必修第一册 必杀技 第一章 空间向量与立体几何 1.4 空间向量的应用 1.4.2 用空间向量研究距离、夹角问题 课时2 用空间向量研究夹角问题人教B版(2019) 选择性必修第一册 必杀技 第一章 空间向量与立体几何 1.2 空间向量在立体几何中的应用 1.2.4 二面角浙江省金华市曙光学校2020-2021学年高二下学期期中数学试题山西省朔州市怀仁市第九中学校2022-2023学年高二上学期期末数学试题
8 . 如图,在四边形
中,
,
,点
为线段
上的一点.现将
沿线段
翻折到
(点
与点
重合),使得平面![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/205e702acfa5443492e490de85abc712.png)
平面
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/15c6e3d42cac4525a600cfaa0bb56f3c.png)
(Ⅰ)证明:
平面
;
(Ⅱ)若
,且点
为线段
的中点,求二面角
的大小.
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/4e90e9a7d2d9485c81de1c28a371ec85.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/59f3d39d8b2942d499d96191962dcc15.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/2a9628a8e1654901b38a501b00dd71be.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/6450cd136387418c87e9d98aacdd2077.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/ac27ad21c2194557be480869af58a20e.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/9725de35452d4f87bb60e896079da649.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/bfc37f8d7557434fa8d97d9b630ff675.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/205e702acfa5443492e490de85abc712.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/f8414d9f81d74f8f948a19c507c92c30.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/f08139489694499285d2200294e31d74.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/205e702acfa5443492e490de85abc712.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/4ed2bc8cd8a94e3a879644272e063c1a.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/82aaab2e79dc4aae9f7bce924d77dce5.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/a10eda6a3b4c47d8ae54577ba14db980.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/92a82b5c57f84df2b49c3ff02461f4a2.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/15c6e3d42cac4525a600cfaa0bb56f3c.png)
(Ⅰ)证明:
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/953b687405dd470f8c8e689fb792a85b.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/205e702acfa5443492e490de85abc712.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/5cea5f5f51ed4f7ab52d20da37c05eb8.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/6450cd136387418c87e9d98aacdd2077.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/ac27ad21c2194557be480869af58a20e.png)
![](https://img.xkw.com/dksih/QBM/2013/4/23/1571194954375168/1571194959855616/STEM/a6ee3d08862f43999129518f0857e1af.png)
您最近一年使用:0次
12-13高三上·湖北省直辖县级单位·期末
名校
解题方法
9 . 如图,四棱锥
中,
底面
,
,点
在线段
上,
.
(Ⅰ)求证:
平面
;
(Ⅱ)若
,
,且
与平面
所成的角为
,求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc7f759828fe6a2e65e7c43070237f9.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/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fc80dcef4a107f2b563e9691ad71c9.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6758b05fe06cc2191907bc273f3cb1.png)
![](https://img.xkw.com/dksih/QBM/2012/2/29/1570781979074560/1570781984587776/STEM/445e4ba3a3aa4ac7aac6d49ce8ae4ec4.png?resizew=203)
您最近一年使用:0次
11-12高三下·上海·开学考试
10 . 如图,已知矩形
的边
与正方形
所在平面垂直,
,
,
是线段
的中点.
![](https://img.xkw.com/dksih/QBM/2012/2/20/1570754496520192/1570754501705728/STEM/19a7d38e751d4aae9ad358476d33e0e9.png?resizew=248)
(1)求证:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92aebf57b643a2b3323d5217be661078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510cad489ea9604845d41a1795b2b7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37838f9e82d7fcebfd8ec0f192dfab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://img.xkw.com/dksih/QBM/2012/2/20/1570754496520192/1570754501705728/STEM/19a7d38e751d4aae9ad358476d33e0e9.png?resizew=248)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400f3d1f13c777161281a00e35970fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d0399ee96906cb1ab244c06ab81362.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25dce91094038bf08dcb65041d7825f.png)
您最近一年使用:0次