1 . 如图,四棱锥
中,
平面
,
,
,
,
为棱
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/d6f4f9b7-c77d-4fc7-bad3-64e2488cfd92.png?resizew=235)
(1)若
,证明:
平面
;
(2)若
,且
平面
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/d6f4f9b7-c77d-4fc7-bad3-64e2488cfd92.png?resizew=235)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33fd089cdee8bb2aaa65a4cd2597398d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982d01f052709b72afeaf1015fc7acc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931bbffda5e872703c9947eccc47ede2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f239fbcc58fc15535db4b5084c4f7253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f239fbcc58fc15535db4b5084c4f7253.png)
您最近一年使用:0次
名校
解题方法
2 . 如图所示,在直三棱柱
中,
,
,
,
,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/2020/11/20/2597166228307968/2602063705047040/STEM/6de76868667349c1b8a6e54f9ab3814e.png?resizew=235)
(1)若
,求异面直线
和
所成角的余弦值;
(2)若直线
与平面
所成角为
,试确定点
的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae15e5357601ddb7e303b56dbe337145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4b6c682d7b0741fb1f12a073394fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a9394f4b28f399fc860cb6f91ca2a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/2020/11/20/2597166228307968/2602063705047040/STEM/6de76868667349c1b8a6e54f9ab3814e.png?resizew=235)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a5dcddf71a68471452cc8c1df24d737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
2020-11-27更新
|
264次组卷
|
8卷引用:湖北省武汉市蔡甸区汉阳一中2020届高三下学期仿真模拟(一)理科数学试题
3 . 如图,已知四边形
为菱形,对角线
与
相交于O,
,点E不在平面
内,平面
平面
直线
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/78eb0fd2-8300-4ef6-923e-5c32fde0657d.png?resizew=202)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
![](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/71a46dc0bb5d8fa33583817e530a5d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ab57908e1b59489ef96429867e1988c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415e6f7fde6787a96f948aa95ce76a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3242c297fb83fffc2e021bb789336a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e0be87f010ae2690c8ea22c257be0b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/78eb0fd2-8300-4ef6-923e-5c32fde0657d.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb5f97d47fbb49fcfcdc7f5e882a80b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
您最近一年使用:0次
名校
解题方法
4 . 如图所示的斜三棱柱
中,点
在底面
的投影
为
边的中点,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/9/19/2553312417579008/2553367923015680/STEM/326ac38e5d024824babd68b6a5d1444c.png?resizew=274)
(1)证明:平面
平面
;
(2)求平面
与平面
所成的锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://img.xkw.com/dksih/QBM/2020/9/19/2553312417579008/2553367923015680/STEM/326ac38e5d024824babd68b6a5d1444c.png?resizew=274)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140088b0cb73812aa9d523c44559298a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
您最近一年使用:0次
2020-09-19更新
|
2172次组卷
|
3卷引用:湖北省武汉市蔡甸区汉阳一中2021届高三下学期二模数学试题
名校
解题方法
5 . 如图,在四棱锥
中,
平面ABCD,
,
,
,
.E为PD的中点,点F为PC上靠近P的三等分点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/223239ba-6654-40e1-9ad7-aae5e21e4afc.png?resizew=160)
(1)求二面角
的余弦值;
(2)设点G在PB上,且
.判断直线AG是否在平面AEF内,说明理由.
![](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/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a923784f083b7f4777891afe06b44e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/223239ba-6654-40e1-9ad7-aae5e21e4afc.png?resizew=160)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74011b64ff147ac2f10c36a11ac1b34d.png)
(2)设点G在PB上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557010ef2b20618df4771ac66daef18f.png)
您最近一年使用:0次
2020-09-04更新
|
355次组卷
|
3卷引用:湖北省武汉外国语学校2020届高三下学期高考冲刺押题联考(一)数学(理)试题
名校
解题方法
6 . 如图所示,多面体是由底面为
的直四棱柱被截面
所截而得到的,该直四棱柱的底面为菱形,其中
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/8/3/2520107171741696/2520865646133248/STEM/5023e29d8aa145248d90e4900008d5b1.png?resizew=137)
(1)求
的长;
(2)求平面
与底面
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/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4982bdbeb295651557a71800f567444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://img.xkw.com/dksih/QBM/2020/8/3/2520107171741696/2520865646133248/STEM/5023e29d8aa145248d90e4900008d5b1.png?resizew=137)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2020-08-05更新
|
569次组卷
|
4卷引用:湖北省武汉市2020届高三下学期6月适应性考试(供题一)理科数学试题
湖北省武汉市2020届高三下学期6月适应性考试(供题一)理科数学试题(已下线)专题04 立体几何——2020年高考真题和模拟题理科数学分项汇编吉林省长春市第八中学2020届高三考前浏览卷数学(理)试题四川省泸州市泸县第四中学2020-2021学年高三上学期一诊模拟考试理科数学试题
名校
解题方法
7 . 正方体
的棱长为3,点
,
分别在棱
,
上,且
,
,下列命题:①异面直线
,
所成角的余弦值为
;②过点
,
,
的平面截正方体,截面为等腰梯形;③三棱锥
的体积为
;④过
作平面
,使得
,则平面
截正方体所得截面面积为
.其中所有真命题的序号为( )
![](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/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbafedc202bd0d86c4dfdece9f8f4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1916d2aa3b9a7d351c6389ed75cbd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9f6d0396928eb0154373244c9aae74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d41840af35e218a5639a2eff4d80b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/5e5a44046c8232c8b81924036c6ba9ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c297eb80dce2764c2ba045fdee42bab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a042179f50ab26493ce2505fa898c35d.png)
A.①④ | B.①②③ | C.①③④ | D.①②③④ |
您最近一年使用:0次
2020-08-01更新
|
1124次组卷
|
2卷引用:湖北省武汉市华中师范大学第一附属中学2020届高三下学期高考押题考试理科数学试题
名校
8 . 如图,
,
,
均为正三角形,
,
中点为
,将
沿
翻折,使得点
折到点
的位置.
![](https://img.xkw.com/dksih/QBM/2020/7/20/2510021193916416/2511218922577920/STEM/caa2a4a6444e44869eeafa17cf317b38.png?resizew=431)
(1)证明:
平面
;
(2)当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2510021193916416/2511218922577920/STEM/caa2a4a6444e44869eeafa17cf317b38.png?resizew=431)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3e27f6e6d1592408508cc9fd14d480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
您最近一年使用:0次
2020-07-22更新
|
1134次组卷
|
4卷引用:湖北省武汉市华中师范大学第一附属中学2020届高三下学期高考押题考试理科数学试题
解题方法
9 . 如图,已知四棱锥
中,
,底面ABCD为菱形,
,点E为的AD中点.
![](https://img.xkw.com/dksih/QBM/2020/7/3/2498190502494208/2498592430202880/STEM/0ef028d04d504debb31c5d9c1f7842b5.png?resizew=189)
(1)证明:平面
平面PBE;
(2)若
,二面角
的余弦值为
,且
,求PE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://img.xkw.com/dksih/QBM/2020/7/3/2498190502494208/2498592430202880/STEM/0ef028d04d504debb31c5d9c1f7842b5.png?resizew=189)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87aed767c861502aff771e6b0114746c.png)
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解题方法
10 . 已知正方体
棱长为
,如图,
为
上的动点,
平面
.下面说法正确的是()
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497147850006528/2497362187362304/STEM/0b7f09cb57364e58a9b7a42001da07a0.png?resizew=240)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2020/7/2/2497147850006528/2497362187362304/STEM/0b7f09cb57364e58a9b7a42001da07a0.png?resizew=240)
A.直线![]() ![]() ![]() |
B.点![]() ![]() ![]() |
C.点![]() ![]() ![]() ![]() ![]() |
D.已知![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
2020-07-02更新
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