如图,在正方体ABCD-A1B1C1D1中,点E,F分别为棱DD1、BB1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/1c50aa02-91c5-4d7a-84fa-0b76f841ce06.png?resizew=175)
(1)证明:直线CF//平面
;
(2)若该正方体的棱长为4,试问:底面ABCD上是否存在一点P,使得PD1⊥平面A1EC1,若存在,求出线段DP的长度,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/1c50aa02-91c5-4d7a-84fa-0b76f841ce06.png?resizew=175)
(1)证明:直线CF//平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fd7d2bc169d4467ad7d70861ed6351.png)
(2)若该正方体的棱长为4,试问:底面ABCD上是否存在一点P,使得PD1⊥平面A1EC1,若存在,求出线段DP的长度,若不存在,请说明理由.
21-22高二上·江苏镇江·期中 查看更多[3]
江苏省镇江市丹阳市2021-2022学年高二上学期期中数学试题江西省赣州市赣县第三中学2021-2022学年高二12月月考数学(理)试题(已下线)第06讲 向量法求空间角(含探索性问题) (高频考点—精练)
更新时间:2021-12-11 08:53:18
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相似题推荐
解答题-证明题
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【推荐1】如图,在正方体
中.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/0fbe296c-5a65-4c8c-962f-547ad396d737.png?resizew=166)
(1)求证:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/0fbe296c-5a65-4c8c-962f-547ad396d737.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efd3ad8ddccdc251c85533353d2633f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce93d167f4591e845358ee3190e1f7c.png)
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解题方法
【推荐2】如图,在三棱柱
中,侧面
是菱形,
,
是棱
的中点,
,
在线段
上,且
.证明:
面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8035fc825a001d7d9a3dacd8271662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29e8a1eefb6776168969a1155c9e9c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0bdfac108885ef12b2a14c2b6fe643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53eec6b6fbd4e275f92828298a4bcfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8035fc825a001d7d9a3dacd8271662.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/489facab-a316-4daf-9243-1a92b683f6ba.png?resizew=317)
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【推荐2】已知
,
;
(1)若
,求实数
的值;
(2)若
,且
,求
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44166d347f02d244d835744d88bab2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e53924c843015e574c8a957fefd9a3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86805e66b07917c8dba41073ef8d7359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15befbdad977723a86194979c675ee5d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f865d8a11866e8f234da2341e73044a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbe78d37d5c991c62c33b1ff2c9ab54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524594bf0942ed86f56fc1eee120a81a.png)
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【推荐1】如图,在四棱锥
中,
底面
,
,
,
,
,
,
,点
为棱
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/faeda8fc-dc4d-49c7-a057-42e3074dd686.png?resizew=170)
(1)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
平面
,求实数
的值;
(2)若
平面
,求直线
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d2fc1ae143960a13e51a726af81b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcb455810d84b022b7790ecac3447779.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/faeda8fc-dc4d-49c7-a057-42e3074dd686.png?resizew=170)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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解题方法
【推荐2】如图,长方体
被经过
的动平面
所截,
分别与棱
,
交于点
,
,得到截面
,已知
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/1230f253-5110-4b3a-9966-599b0c6c67a5.png?resizew=200)
(1)求证:
;
(2)若直线
与截面
所成角的正弦值为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.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/04e2716ce378210c8f68ef460071d7ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cd35124a6f8e8fe6c6af0a5700b3ab4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/1230f253-5110-4b3a-9966-599b0c6c67a5.png?resizew=200)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee50a23604ea2a9c1f3649dab97c2e7.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e2716ce378210c8f68ef460071d7ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821309f088a175c00dc0f4828334503d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
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【推荐3】如图,C是以
为直径的圆O上异于A,B的点,平面
平面
,
为正三角形,E,F分别是棱
上的点,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/fa75d81c-4f9e-4e52-a607-0acb2ec067e4.png?resizew=159)
(1)求证:
;
(2)是否存在
,使得直线
与平面
所成角的正弦值为
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829a1a887ceba13dd8551b1e3604bf6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eac032ea7bacc28a9ab1037ae8d9a9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/fa75d81c-4f9e-4e52-a607-0acb2ec067e4.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff24d05b5b9502c2be337f9be84fe4ed.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d172f55bc57ef5b5c2c1ad5b167440b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐1】在三棱柱
中,
,侧棱
平面
,
.若
为线段
的中点,在线段
上求一点
,使
最小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd5a4a2b890cc93fdb9800915722fdbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2711c316640ccc001a2817eb62630902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a9ea4d6da4898717a50e02a385f8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd37244e07a7f1e6b0d8afdb469cf76e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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【推荐2】如图1,在直角梯形ABCD中,
,
,且
.现以
为一边向梯形外作正方形ADEF,然后沿边AD将正方形ADEF折起,使
,M为线段DE上的动点,如图2.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893674172907520/2894437432590336/STEM/4e49feea-6019-4e27-b4c6-154fb082b1ba.png?resizew=395)
(1)求二面角
的大小;
(2)设
,若AM所在直线与平面BCE相交,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3da6e90f9c9617cd495abb57ab9b0e0.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893674172907520/2894437432590336/STEM/4e49feea-6019-4e27-b4c6-154fb082b1ba.png?resizew=395)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d0f5cb6765dcb8c1d1be85c236c824.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b28ac4c892fdb3a0ae75b65dbad61c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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