名校
1 . 如图,已知
,
,
,
.求证:直线AB与a是异面直线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72d2a947e3fdc214d40a7d3f54679a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b031042c19fc3faffddcc62d9677033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2a47e92905ab5564a0c60951d332a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6a51475f6c4fafac51a095f0744eea.png)
您最近一年使用:0次
2023-10-05更新
|
269次组卷
|
3卷引用:江西省景德镇一中2020-2021学年高二上学期期末考试数学(理)试题
江西省景德镇一中2020-2021学年高二上学期期末考试数学(理)试题湘教版(2019)必修第二册课本例题4.3.1 空间中直线与直线的位置关系(已下线)第一章 点线面位置关系 专题六 异面直线 微点1 异面直线的性质、判定与证明【培优版】
2 . 如图,三棱柱
的所有棱长均为
,底面
侧面
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118643569844224/2119113067282432/STEM/5cce867b62314992832795a2b2928792.png?resizew=202)
(1)证明:
平面
.
(2)若
是棱
上一点,且满足
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99bfa2ca4e398c8ab0f97f47add3754f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d55f92fba01d16c84c9a6b48b64c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c02691431ef4a3d2395100c1f1b83b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094e639c2b31dc54b1b3e6456e77843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e3f1fa2915d61429ff48b78d6bed5c.png)
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118643569844224/2119113067282432/STEM/5cce867b62314992832795a2b2928792.png?resizew=202)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe2f20fc44f314a589b3a0be781045a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96f31276bc67d1da3398e0cef9b41ae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f524a06030e52ae3832449523d2bb361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee0d7c4f11e7e4704be278b7c7c9f39.png)
您最近一年使用:0次
2017-11-06更新
|
946次组卷
|
3卷引用:【全国百强校】江西省新余四中、上高二中2019届高三第二次联考数学(理)试题