如图所示,在正方体ABCD-A1B1C1D1中,E,F分别为DD1和BB1的中点.求证:四边形AEC1F是平行四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/5c0968d7-8546-4523-b3f4-cc4d581aabf7.png?resizew=160)
20-21高二·全国·课后作业 查看更多[3]
(已下线)第八课时 课中 1.4.1.2 空间中直线、平面的平行(已下线)专题09 空间向量与平行关系(重点突围)-【学霸满分】2022-2023学年高二数学下学期重难点专题提优训练(苏教版2019选择性必修第二册)(已下线)专题05 用空间向量研究直线、平面的平行、垂直问题10种常见考法归类 - 【考点通关】2023-2024学年高二数学高频考点与解题策略(人教A版2019选择性必修第一册)
更新时间:2021-08-27 12:48:25
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【推荐1】如图,在四棱锥
中,底面
是边长为1的正方形,侧棱
的长为2,且
.若
是
的中点,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/1b10b262-8e55-4559-942b-cc339bbb3050.png?resizew=177)
(1)将空间向量
与
用
表示出来;
(2)求线段BM的长.
![](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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82859ba121b1e57981698d010a18121.png)
![](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/65fd87d69ceb40aca25be58688654725.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/1b10b262-8e55-4559-942b-cc339bbb3050.png?resizew=177)
(1)将空间向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b683529d8299e73e36ef06d0b1463d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a046d7060dc843c78af806ee24f556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
(2)求线段BM的长.
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【推荐2】如图,四面体
的各棱长均为2,
,
分别为棱
,
的中点,又设
,
,
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/d350ddf9-9279-4c2a-a4e7-55e99c3f909a.png?resizew=138)
(1)用向量
,
,
的线性组合表示向量
,
;
(2)求向量
,
的夹角的大小.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cbea5ead335c45b6c2974e718f30c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f864f1b6dd2b79a48d9b30f7b96cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de8de323c29074533289bdf437e2d6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/d350ddf9-9279-4c2a-a4e7-55e99c3f909a.png?resizew=138)
(1)用向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f33a112e9728d7b560199765c815f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf814115dc9fea36cc1b6cd2b293390.png)
(2)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f33a112e9728d7b560199765c815f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf814115dc9fea36cc1b6cd2b293390.png)
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【推荐1】如图,已知
分别为四面体
的面
与面
的重心,
为
上一点,且
.设
.
(1)请用
表示
;
(2)求证:
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905943d59ef17fdb1d29b626b0847d29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb0493ebe599f2bc513e63e908bfd45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/98a3a9cf-687c-4a6e-b67e-ee4f9fa8ba54.png?resizew=167)
(1)请用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed18a92338c7578c18a5ba3a2ae1ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350f162ee9aa08f4c9779481a5ef1025.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b772d03da5f597caaf8ab796e564b7d.png)
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【推荐2】已知点
,
是直线l上的两点.
(1)求直线l的一个方向向量;
(2)判断点
是否在直线l上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40cb141eaf6c8146304d0bf6dc9bd379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c63d58f2a8b881b1f5599a2aaedf445.png)
(1)求直线l的一个方向向量;
(2)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edefddd404606e9e8abbda760f6ddb3.png)
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【推荐3】如图,在正四棱柱
中,
.点E,F,G,H分别在棱
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/cc3d4739-9c86-444f-bb35-a421b503434a.png?resizew=113)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed5e5d514bba98dbd038d0857a34ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360a93b9662f0ab8a69b131497520b53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bb3bb65447a6d1c8d2891d9c8f8bdf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/cc3d4739-9c86-444f-bb35-a421b503434a.png?resizew=113)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5c87a4eeba6042558a1a7cc31b5c1d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6917095bea8efd3154b72d737f013.png)
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解题方法
【推荐1】如图,在三棱柱
中,
平面
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/c79735a0-9659-4d9d-9ea7-c15604eec8b9.png?resizew=144)
(1)求证:
;
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe312c442d13f937a286c0ed069d6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f61ef77be3243e46e5591c4bc4c99942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/6655cc150ddc9deba2254780984d0024.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/c79735a0-9659-4d9d-9ea7-c15604eec8b9.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b500528c1f0ed3a48e63a44788b9956.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
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【推荐2】在长方体
中,E,F分别是棱BC,CC1上的点,CF=AB=2CE,AB∶AD:AA1=1∶2∶4
![](https://img.xkw.com/dksih/QBM/2021/12/26/2880413898670080/2886708501798912/STEM/b622fed7-470c-4088-864e-0cfec6ce3f42.png?resizew=171)
(1)求异面直线EF,A1D所成角的余弦值;
(2)证明∶AF⊥平面
;
(3)求二面角A-ED-F正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2021/12/26/2880413898670080/2886708501798912/STEM/b622fed7-470c-4088-864e-0cfec6ce3f42.png?resizew=171)
(1)求异面直线EF,A1D所成角的余弦值;
(2)证明∶AF⊥平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c9f260496ba23993238601a89eca5c.png)
(3)求二面角A-ED-F正弦值.
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