如图,
平面
,矩形
的边长
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572693667168256/1572693673435136/STEM/750e918aa7284f5b83cd84c7bbe18c21.png)
(1)证明:
;
(2)如果异面直线
与
所成的角的大小为
,求
的长及点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/551e4cd76a93de89ea2750160fe74923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9daed11dd71c6f0a2b1bcf37988dac17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572693667168256/1572693673435136/STEM/750e918aa7284f5b83cd84c7bbe18c21.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fc2b16f468c98640e47ef9a088b053.png)
(2)如果异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdab625e32e38d1c72c901cece0e147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425bb0d1c21eb4448dbbe9a41efa7538.png)
更新时间:2016-12-03 23:07:23
|
相似题推荐
解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】如图,已知正三棱柱
的体积为
,底面边长为3,求异面直线
与
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604d037b88148502a5608e0285c76f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2021/3/26/2686301371506688/2686336020226048/STEM/76486dbe-4dfc-466d-9b28-95251772fb5e.png?resizew=185)
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解答题-问答题
|
较易
(0.85)
【推荐2】如图,已知正方体
的棱长为1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/59bda10a-ad2a-42af-9402-0ce7b7443ee7.png?resizew=141)
正方体
中哪些棱所在的直线与直线
是异面直线?
若M,N分别是
,
的中点,求异面直线MN与BC所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6340d11f7af9c3c54b86a8fdce5c09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/59bda10a-ad2a-42af-9402-0ce7b7443ee7.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6340d11f7af9c3c54b86a8fdce5c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837076091c6b40ecb7020f499770fb0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837076091c6b40ecb7020f499770fb0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac791610a6d17a94d57b92dbbf11194c.png)
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解答题-证明题
|
较易
(0.85)
【推荐1】如图,几何体
是四棱锥,
为正三角形,
,
,
,
,
是
上的点,且
.
![](https://img.xkw.com/dksih/QBM/2016/10/17/1573073464238080/1573073470455808/STEM/57b54374a4f04210a2a34b8861313918.png)
(1)求证:
平面
;
(2)求
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790b15331ab5462fb909a797d30ffdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da95ecece2225aeaa4fd2ea84dc61753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7cad5d540488b66699a2cc72b882d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90aaaf152820773ea5de913d590d56f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff235a4cf9fdd26ecfaac57f200c9738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f713da7dce54965bbef060ad2b507e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c733d0f011ebcdf17fbd3f3f9c2ba2b.png)
![](https://img.xkw.com/dksih/QBM/2016/10/17/1573073464238080/1573073470455808/STEM/57b54374a4f04210a2a34b8861313918.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3f3cd7dc815e9baf79d40119a9498d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
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解答题-证明题
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较易
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【推荐2】在四棱锥
中,
平面
,
是边长为4的正三角形,
与
的交点
恰好是
中点,又
,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2015/5/13/1572104921440256/1572104926822400/STEM/404276c2494643d380e695e7a2ff3de3.png)
(1)求证:
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb18e947166d2fb0110967c885abe358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950d90f852dc2881b29cf4ee7fd853ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c7ee52fd507ca5ec79ae9631847b9.png)
![](https://img.xkw.com/dksih/QBM/2015/5/13/1572104921440256/1572104926822400/STEM/404276c2494643d380e695e7a2ff3de3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aacb89c9441afb299130f0ac59a761.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
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