如图,边长为1的正方形
所在平面与正方形
所在平面互相垂直,动点
,
分别在正方形对角线
和
上移动,且
则下列结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ccc1c999-61cc-46cc-8cc6-c2447ecf9256.png?resizew=167)
则下列结论:
①当
时,
与
相交;
②
始终与平面
平行;
③异面直线
与
所成的角为
.
正确的序号是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec6a9edd2407d0bb7a628a8f2a27c9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/ccc1c999-61cc-46cc-8cc6-c2447ecf9256.png?resizew=167)
则下列结论:
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
③异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
正确的序号是
20-21高一下·内蒙古包头·期中 查看更多[3]
内蒙古自治区包头市第六中学2020-2021学年高一下学期期中数学试题山东省烟台市莱州市第一中学2021-2022学年高二上学期10月月考数学试题(已下线)专题1.3 空间向量与立体几何 章末检测3(难)-【满分计划】2021-2022学年高二数学阶段性复习测试卷(人教A版2019选择性必修第一册)
更新时间:2021-08-17 11:17:01
|
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适中
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解题方法
【推荐1】如图,在正三棱柱
中,
,
,P为线段
上的动点,且
,则下列命题中正确的是___________ .
![](https://img.xkw.com/dksih/QBM/2022/3/25/2943953569005568/2946520702754816/STEM/657b1c20-82a8-4916-952e-b4045e66b05a.png?resizew=138)
(1)存在
使得
;
(2)当
时,异面直线
和
所成角的余弦值为
;
(3)当
时,三棱锥
的外接球体积为
;
(4)过P且与直线
和直线
所成角都是60°的直线有三条.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca37feb165ab4711a42c47fe929e5624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ab543282d9b830fda43ddf62762208.png)
![](https://img.xkw.com/dksih/QBM/2022/3/25/2943953569005568/2946520702754816/STEM/657b1c20-82a8-4916-952e-b4045e66b05a.png?resizew=138)
(1)存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90bcfd448fc7d2d52b55874c9e6201e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f83464bf17f9d4d9ee6a7f299539871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588eb9393564a33552c4b2e8de837ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131cfa82f83b885d57a05235463d1b03.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c117ff1623684173352cf7271248239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97d10ac1b9cfcd8e651f99713e18e621.png)
(4)过P且与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
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解题方法
【推荐2】若直线a的方向向量为
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(1)若
⊥
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(2)若
∥
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(3)若
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(4)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f1a8e551cba7ec9f451749f60e628d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f1a8e551cba7ec9f451749f60e628d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc8dc72e09320ad0abc9add8936ca7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
(4)若
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名校
解题方法
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【推荐2】有很多立体图形都体现了数学的对称美,其中半正多面体是由两种或两种以上的正多边形围成的多面体,半正多面体因其最早由阿基米德研究发现,故也被称作阿基米德体.如图,这是一个棱数为
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