如图,四棱柱
中,
平面
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/63f1e9d2-ecc8-4032-9dc2-b98cfbbbf3f4.png?resizew=179)
(1)证明:
;
(2)若
,
,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ca48b3c0535d84f53352e4166a7c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/63f1e9d2-ecc8-4032-9dc2-b98cfbbbf3f4.png?resizew=179)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c9c7852b781b2bd57e8c95c78f100c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ab46164b23af7a4c4907f176e392ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb04f31343f684b9543cf638e0b320ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3367b6866aa3dff279531fa5d99c768a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
更新时间:2017-05-20 23:45:29
|
相似题推荐
解答题-问答题
|
适中
(0.64)
【推荐1】如图是一个正三棱柱(以
为底面)被一平面所截得到的几何体,截面为
.已知
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/1/21/1572459655667712/1572459661770752/STEM/ab6fb7da1b80452999f90793619fa69e.png)
(1)设点
是
的中点,证明:
平面
;
(2)求
与平面
所成的角的正弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2016/1/21/1572459655667712/1572459661770752/STEM/7840300ffdeb47d28e45b8a13faa17d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fd676c41d2d644928f014b0fea4689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c122ca7141c43c15c783968f5f0dbc19.png)
![](https://img.xkw.com/dksih/QBM/2016/1/21/1572459655667712/1572459661770752/STEM/ab6fb7da1b80452999f90793619fa69e.png)
(1)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b9bf6d1c53a0cc794826f1ea73aeec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】如图,在直三棱柱
中,底面ABC是正三角形,点D是BC的中点,
.
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/3beb857adb574b119409f912f93b4607.png)
(1)求证:
平面
;
(2)试在棱
上找一点M,使得
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad91719bd5fdc1b2d3d5298f2f44cc2.png)
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/3beb857adb574b119409f912f93b4607.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/52eebb968c80413faa903055942421c6.png)
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/db25bff34ae0496db6f33a23f8c6ff29.png)
(2)试在棱
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/04139598a88f4119a42145567ed45869.png)
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/3a40c69341b84501921c9c2a04188436.png)
您最近一年使用:0次
【推荐1】如图,在五面体
中,四边形
是正方形,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709417112903680/2709439195144192/STEM/6d92c473d9894116a996b0b1ebea1bac.png?resizew=167)
(1)求证:平面
平面
;
(2)设
是
的中点,棱
上是否存在点
,使得
平面
?若存在,求线段
的长;若不存在,说明理由.
![](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/5c1c122603b60b6f1a1334ddb56c3fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b31e19fa5cf6d4d5f14f90e87d34ee.png)
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709417112903680/2709439195144192/STEM/6d92c473d9894116a996b0b1ebea1bac.png?resizew=167)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85f14d046c7d50a349b9c1fcf717d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在三棱柱
中,平面
平面
,
,D是
的中点,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/6/4/2735568573464576/2736668990595072/STEM/185fb97b-80f8-4b79-a1f6-c9e3aced56b5.png?resizew=239)
(1)证明:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e96a6b20a35af7755e5d90789ea862da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5aac0c43f94c561bacc7c9ac666f583.png)
![](https://img.xkw.com/dksih/QBM/2021/6/4/2735568573464576/2736668990595072/STEM/185fb97b-80f8-4b79-a1f6-c9e3aced56b5.png?resizew=239)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfaad4c4467e27421876d8f2a4371d2.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,已知四边形
为矩形,四边形
为直角梯形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/b255500d-f3c3-46ec-a4ef-a0a10455e4ad.png?resizew=235)
(1)求证:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226624e3444853e3cf92d8e11c829a90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c618b7895122f6006ce248bf41a029a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4151e948feebdf7b91fbe739feafa9bc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/b255500d-f3c3-46ec-a4ef-a0a10455e4ad.png?resizew=235)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c182a9d9fd0a7023b710cd671d9468e7.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b2ef1b525d302da087241e37387fa6.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在以
,
,
,
,
,
为顶点的五面体中,
在平面
上的射影为
的中点
是边长为
的正三角形,直线
与平面
所成角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/08eddd94-60a0-4b65-99b9-7ed68279013d.png?resizew=145)
(I)求证:
;
(Ⅱ)若
,且
,求该五面体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/08eddd94-60a0-4b65-99b9-7ed68279013d.png?resizew=145)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42861b2a481cec40d8ff0081b01303ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c91baecb97fadd4f8ab49e6effcbc04.png)
您最近一年使用:0次