1 . 数学中有许多形状优美、寓意独特的几何体,正八面体就是其中之一.正八面体由八个等边三角形构成,也可以看做由上、下两个正方椎体黏合而成,每个正方椎体由四个三角形与一个正方形组成.如图,在正八面体ABCDEF中,
是棱BC的中点,则异面直线HF与AC所成角的余弦值是______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
您最近一年使用:0次
解题方法
2 . 佛山是全国著名的工业城市,这里生产的部分产品通过水路运输到全国乃至全世界.下图1是佛山一个货运码头的吊机,其作用是完成集装箱的装船或卸船.为了研究其结构的稳固性,工程师把一个吊机的部分结构(图1中圈住部分)画成图2的空间几何体
.若四边形
是矩形,
,
,
,
,
,
,则直线
与
所成角的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666734423f1818d76a74f171b7420b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b92a72e2b717ef70ea4d5c64f8173a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7c3bffbe68a0b70f084d7be59c4029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f121646549116bba24e250f3bec6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4901a7eda97d6a307db76c4fb196ba3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/990ee89d-5319-47f4-81c3-c83b2e32082b.png?resizew=319)
您最近一年使用:0次
名校
3 . 已知异面直线
所成角的大小为
,直线
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50297ad9f7256b4d2efc3462289f18b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6340b8c5618b64a78e83fe4ab075f0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ddbceabfc3d02a6b6b921f6bf5b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
您最近一年使用:0次
4 . 如图.已知圆锥的轴截面为等边
分别为
,
的中点.
为底面圆周上一点.若
与
所成角的余弦值为
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e32f416d1558ad4512f0628c635607b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
您最近一年使用:0次
2024-01-03更新
|
479次组卷
|
4卷引用:考点14 余弦定理及应用 --2024届高考数学考点总动员【练】
(已下线)考点14 余弦定理及应用 --2024届高考数学考点总动员【练】(已下线)2024届新高考数学信息卷2河南省TOP二十名校2024届高三上学期调研考试九数学试卷广东省广州市广东实验中学2024届高三上学期大湾区数学冲刺卷(三)
5 . 如图,异面直线l,m,
,
,
,
,
,
,且
,
,
,
,则异面直线l,m夹角的余弦值为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a30262f17d1e521b48d773da22ebf452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b76843381162198a14f2faf5e2518b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b043bec560739731fb414fdc47da2ba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77bba07568684a409eaa92e02e0a3829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b9d83969b6a8e27e57ab71b34e2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c50360563e2a58800af3a9cf7d9652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d0ace693aa9871000cceea36255fe0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a73ff3a6a73403c2a25c0d798bb22a33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7302e4f0bb743b611015615376d893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c559671a60d864715ed73729020f0f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/e79e941d-73dd-4db5-b2e9-481fc985eed9.png?resizew=140)
您最近一年使用:0次
名校
解题方法
6 . 设、
、
为空间中三条不同的直线,若
与
所成角为α,
与
所成角为β,其中
,那么
与
所成角的取值范围为
您最近一年使用:0次
解题方法
7 . 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)
您最近一年使用:0次
名校
解题方法
8 . 四面体
中,
,
平面
,
,D是平面
上异于
的动点,且
,设三棱锥
的外接球的体积为V,
与
所成角为
,
与平面
所成角为
,在以下结论中,①V是定值;②V是变化的但有最大值;③
是定值;④
是定值;正确的结论序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a351136b18bc7d3bd5122332772ab23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9723a6e093c297b001436e8932b1820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfc9df9c661bd93b3f4f51f91534c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4243a894993947dbb55d38be49d1447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe0ccf24d760c77535a70c92dad145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/ad8426f6-8596-415d-b0e0-71eb795b3c27.png?resizew=161)
您最近一年使用:0次
2021-08-14更新
|
266次组卷
|
3卷引用:第二章 立体几何中的计算 专题六 空间定值问题 微点4 立体几何中的定角问题【培优版】
(已下线)第二章 立体几何中的计算 专题六 空间定值问题 微点4 立体几何中的定角问题【培优版】河南省洛阳市孟津县第一高级中学2021届高三下学期4月理科数学调研试题河南省洛阳市孟津县第一高级中学2021届高三下学期4月文科数学调研试题