19-20高三下·北京·阶段练习
名校
1 . 在四棱柱
中,
平面
,底面
是边长为
的正方形,
与
交于点
,
与
交于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/9dac9b91-d433-4b8f-a49d-4a69375655f0.png?resizew=220)
(Ⅰ)证明:
平面
;
(Ⅱ)求
的长度;
(Ⅲ)求直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.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/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7f786fc33d0506d64047034e12fd7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/9dac9b91-d433-4b8f-a49d-4a69375655f0.png?resizew=220)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(Ⅲ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
您最近一年使用:0次
15-16高三上·上海浦东新·期中
名校
2 . 如图,在四棱柱
中,侧棱
底面
,
,
,
,
,
,
,(
)
平面
;
(2)若直线
与平面
所成角的正弦值为
,求
的值;
(3)现将与四棱柱
形状和大小完全相同的两个四棱柱拼成一个新的四棱柱,规定:若拼成的新四棱柱形状和大小完全相同,则视为同一种拼接方案,问共有几种不同的拼接方案?在这些拼接成的新四棱柱中,记其中最小的表面积为
,写出
的解析式.(直接写出答案,不必说明理由)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c0ad79161fb29ec231dd0248623ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1a56baf43ffdf67bc8460856e31fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9740124a284f336f20c98695af04ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5cab760038d20eac10fe6108fbb334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f991c5086ba855802b0331c4e02e3f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/223036d27be5914db50fbd5cb19d4212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4e6eb3663870ed202cc208eaf239dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)现将与四棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7a84d7e5d6236009a8be655bd500fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7a84d7e5d6236009a8be655bd500fd.png)
您最近一年使用:0次
2020-02-05更新
|
849次组卷
|
5卷引用:北京市一零一中学2021-2022学年高二上学期期末考试数学试题
北京市一零一中学2021-2022学年高二上学期期末考试数学试题(已下线)上海市华东师大二附中2016届高三上学期期中数学试题(已下线)上海市华东师范大学第二附属中学2020-2021学年高二下学期期中数学试题(已下线)第一章 空间向量与立体几何(压轴必刷30题4种题型专项训练)-【满分全攻略】2023-2024学年高二数学同步讲义全优学案(人教A版2019选择性必修第一册)辽宁省实验中学2024届高三考前模拟数学试卷
名校
3 . 如图,在三棱锥
中,平面
平面
,
和
均是等腰直角三角形,
,
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/88107e3f-fe40-4291-9413-ea576d7ceb4e.png?resizew=153)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
;
(Ⅲ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11477bf45c2ad9d554d8f2dbacb5bb67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6677a7d5693deb7e41ed70ecca68f7de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2513bfc5f4c4cbc7c07725b9d59bda6.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/dd4fce8e923062b9779553d6f282895b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/88107e3f-fe40-4291-9413-ea576d7ceb4e.png?resizew=153)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99116c812715c5e15ee73d088da4c253.png)
(Ⅲ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
您最近一年使用:0次
2020-01-10更新
|
1034次组卷
|
6卷引用:北京市海淀区2019-2020学年高三上学期期末数学试题
4 . 如图,在四棱锥
中,平面
平面
,
是边长为
的等边三角形,
,
,
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/6ca63356-1a83-49ff-96bd-fc8e57687d2a.png?resizew=190)
(1)求证:
平面
;
(2)求证:
;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ecf025b484f24d1aef7e73a7a800105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c674dc5024374f53920947c4cf4baf11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3602ec4c8f5ac2737fa78c05708c869f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b405a122ded2eb0395d5434892ae7b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f64f78e151b46db08660df64a0c6132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/6ca63356-1a83-49ff-96bd-fc8e57687d2a.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ee5f3950aa6f59c76cf91c3ed8f290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4734735213b599a9915e1ed91a5d8ce4.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051ca3c8e6421a0bd30620416468dd42.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a8d99c75180422fecf6d3f3d2910b34.png)
您最近一年使用:0次
5 . 如图,在四棱锥P-ABCD中,底面ABCD为正方形,平面PAD⊥底面ABCD,PD⊥AD,PD=AD,E为棱PC的中点
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/37910157-d153-450a-b242-9b1c663b3d30.png?resizew=152)
(I)证明:平面PBC⊥平面PCD;
(II)求直线DE与平面PAC所成角的正弦值;
(III)若F为AD的中点,在棱PB上是否存在点M,使得FM⊥BD?若存在,求
的值,若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/37910157-d153-450a-b242-9b1c663b3d30.png?resizew=152)
(I)证明:平面PBC⊥平面PCD;
(II)求直线DE与平面PAC所成角的正弦值;
(III)若F为AD的中点,在棱PB上是否存在点M,使得FM⊥BD?若存在,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754a74bf749ce5f8edbc831f8d303bed.png)
您最近一年使用:0次
6 . 在四棱锥
中,底面ABCD是边长为6的菱形,且
,
平面ABCD,
,F是棱PA上的一个动点,E为PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/4086c97a-4b87-49b6-96cf-3b1d1d517446.png?resizew=215)
Ⅰ
求证:
.
Ⅱ
若
.
求PC与平面BDF所成角的正弦值;
侧面PAD内是否存在过点E的一条直线,使得该直线上任一点M与C的连线,都满足
平面BDF,若存在,求出此直线被直线PA、PD所截线段的长度,若不存在,请明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81c4eb8e521dc6df68b21535c14d457.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e84fa1225cd44c8d7dbd2de8706e23.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/4086c97a-4b87-49b6-96cf-3b1d1d517446.png?resizew=215)
![](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/5f87813b3e91c9d0713c22ec6ab9567d.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/a8e8496e60bdb90f9de213a9ea39bc79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372470aee75717ec33c53c3434eb126d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18eca8193d91e13a240dec14be339cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400f3d1f13c777161281a00e35970fa8.png)
您最近一年使用:0次
名校
7 . 如图,在三棱锥
中,
底面ABC,
点D,E分别为棱PA,PC的中点,M是线段AD的中点,N是线段BC的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/27e7e0b1-30db-4550-b0d3-1cdf75cfe4f6.png?resizew=168)
Ⅰ
求证:
平面BDE;
Ⅱ
求直线MN到平面BDE的距离;
Ⅲ
求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2aaed1e9ead175f30f7130569d0411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8af87e1de5e0ad0b6679e6cf793e9da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2db8953f056f64a0342f7dfef7e135.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/27e7e0b1-30db-4550-b0d3-1cdf75cfe4f6.png?resizew=168)
![](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/dd19c4db61254be8512edf741bf9f978.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/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7fd3d2c1fce7172a81a1c34df13535c.png)
您最近一年使用:0次
2019-03-13更新
|
1719次组卷
|
5卷引用:【区级联考】北京市东城区2018-2019学年高二上学期期末检测数学试题
8 . 如图,正方形
与梯形
所在的平面互相垂直,
,
,
,
,
为
的中点.
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/30/27396d36-39a5-417e-a0a1-bbd7128408ec.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2061b9ab3862d9c36d32c4ffef91145a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3547a914468b082d8d8741b974a03190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
您最近一年使用:0次
2016-12-03更新
|
2290次组卷
|
5卷引用:2011届北京市东城区高三上学期期末理科数学卷
9 . 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
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4333次组卷
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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)
2011·北京石景山·一模
10 . 在棱长为2的正方体ABCD—A1B1C1D1中,E,F分别为A1D1和CC1的中点.
![](https://img.xkw.com/dksih/QBM/2011/4/6/1570104326553600/1570104331878400/STEM/7d1705ace184438aab88b961415e3259.png?resizew=199)
(Ⅰ)求证:EF//平面ACD1;
(Ⅱ)求异面直线EF与AB所成的角的余弦值;
(Ⅲ)在棱BB1上是否存在一点P,使得二面角P—AC—B的大小为30°?若存在,求出BP的长;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2011/4/6/1570104326553600/1570104331878400/STEM/7d1705ace184438aab88b961415e3259.png?resizew=199)
(Ⅰ)求证:EF//平面ACD1;
(Ⅱ)求异面直线EF与AB所成的角的余弦值;
(Ⅲ)在棱BB1上是否存在一点P,使得二面角P—AC—B的大小为30°?若存在,求出BP的长;若不存在,请说明理由.
您最近一年使用:0次