1 . 如图所示为某高中校内伫立于教学楼前的“孔子像”的底座模型图,该底座可看作正方体
与直三棱柱
的组合体,且
为等腰直角三角形,则直线
与直线
所成的角为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/a8cbbe99-a462-4061-801a-ccbdd580919e.png?resizew=168)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3f94e512b82a5ece87e80fc1b6f94c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed4f906ea87311426ea88a8decef9b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7168c9b611be134a7a2752aff9d7261.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/a8cbbe99-a462-4061-801a-ccbdd580919e.png?resizew=168)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 如图,在四棱锥
中,
底面
,
,
,点
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2017/5/28/1696902730899456/1697574986203136/STEM/aad2ffd2ced1412ca368cbb3032723a2.png?resizew=198)
(1)证明:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cff8c9f12d51b23c4b0beaf228b5c95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2017/5/28/1696902730899456/1697574986203136/STEM/aad2ffd2ced1412ca368cbb3032723a2.png?resizew=198)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c38bbe49284a2ceab26001ced8cfd56.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31445984ddb32c9d7cfd25def849e7f6.png)
您最近一年使用:0次
2017-05-29更新
|
1400次组卷
|
7卷引用:四川省达州市高级中学2018届高三上学期同步测试数学(理)试题