如图,在直三棱柱
中,底面
是直角三角形,且
,
,其中
,
分别是
,
上的点且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/54101104-b394-4628-8192-03563c15682c.png?resizew=156)
(1)求证:MN
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1bcc181aa254e91bfc333c966e4637d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00566b498fa4a541e154ffcf2c19d0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b462c21e9d780337650cd97614d8327d.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423cd617e81adcbab86786cbe3cb6ade.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/54101104-b394-4628-8192-03563c15682c.png?resizew=156)
(1)求证:MN
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3fb82553d568ea8aae9d0dd89ae1ca2.png)
更新时间:2020-10-18 10:36:17
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】正三棱柱
中,
是
的中点,
.
(1)求异面直线
与
所成的角;
(2)求点
到平面
的距离;
(3)判断
与平面
的位置关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c74f0a92fa5f546701a71f623e0fe0.png)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588eb9393564a33552c4b2e8de837ca5.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2e84d6e368f8368f8301c4cd66d6dd.png)
(3)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba9e20d667d04bf3ee7f55cc795ce01.png)
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解答题-证明题
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(0.65)
名校
【推荐2】如图,在四棱锥
中,底面
是正方形,
底面
,
,
分别是
,
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2018/4/12/1922586426564608/1923010062139392/STEM/37de22c1-8dce-42d0-ab49-c68dbdb73849.png)
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba76d6e2590f8df41b763a554f09c1f0.png)
![](https://img.xkw.com/dksih/QBM/2018/4/12/1922586426564608/1923010062139392/STEM/37de22c1-8dce-42d0-ab49-c68dbdb73849.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
解答题-证明题
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适中
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【推荐1】如图1所示,梯形ABCD中,AD=2AB=2BC=2CD=4.E为AD的中点,连结BE,AC交于F,将△ABE沿BE折叠,使得平面ABE⊥平面BCDE(如图2)
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912825895124992/2937298439553024/STEM/7374f0f9-c946-44b8-bf0a-76d044ec16fc.png?resizew=454)
(1)求证:AF⊥CD;
(2)求平面AFC与平面ADE所成的二面角的正弦值.
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912825895124992/2937298439553024/STEM/7374f0f9-c946-44b8-bf0a-76d044ec16fc.png?resizew=454)
(1)求证:AF⊥CD;
(2)求平面AFC与平面ADE所成的二面角的正弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知底面
是正方形,
平面
,
,
,点
、
分别为线段
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/4675b42a-0d4e-481a-a221-972ebb5d3d1f.png?resizew=163)
(1)求证:
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/d0f72df9cbc97b66ba8670cb6d738ddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c552df4af28e6a0a7cb993731958fddf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/10/4675b42a-0d4e-481a-a221-972ebb5d3d1f.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50839c95d7a2adf8f0faf6ee182d20e0.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4613db540c9cb6a9d7e963bf89c2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c133b31ab3c50dc87d80879bbb0633.png)
您最近一年使用:0次