如图,在四棱锥
中,
平面
,四边形
为正方形,点
分别为线段
上的点,
.
![](https://img.xkw.com/dksih/QBM/2016/11/12/1573144910307328/1573144916525056/STEM/00d1002ca68545afa77ff5412ddd1a06.png)
(1)求证:平面
平面
;
(2)求证:当点
不与点
重合时,
平面
;
(3)当
,
时,求点
到直线
距离的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](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/03487f5fd895b1cff40091a2b252b76f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd9cb9836784741461e5e38d8dd9d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd03035fbfed2684d90b676c1916254f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/12/1573144910307328/1573144916525056/STEM/00d1002ca68545afa77ff5412ddd1a06.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6975ec118f40dc2feb16fb2dcde3285c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求证:当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632cd8713d2f1ec8741d7374c76a80cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
更新时间:2016-12-05 00:34:26
|
相似题推荐
解答题-问答题
|
适中
(0.64)
【推荐1】已知在长方体
中,
分别是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2016/10/6/1573055573901312/1573055579578368/STEM/6467c61bd80b4195aff68f701d99fb97.png)
(I)证明:
∥平面
;
(II)求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456cee87c4e22351affc28f3a73a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c88339e64acf5f1efeaea8e9c856ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ef611321cd8b655f4307fa04704ee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3442496f4eb1901fa9e226e626268d.png)
![](https://img.xkw.com/dksih/QBM/2016/10/6/1573055573901312/1573055579578368/STEM/6467c61bd80b4195aff68f701d99fb97.png)
(I)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
(II)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193b5b41994c2a4dfa5bb0bc984061cc.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】一木块如图所示,点
在平面
内,过点
将木块锯开,使截面平行于直线
和
,应该怎样画线?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36957cc47e8b85809737f005345fd619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/22/1573089268776960/1573089275076608/STEM/90442775-255c-4537-a0e2-a6d3adcb8adf.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】在如图所示的多面体中,
平面
,
平面
,
,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828554282008576/2830058682859520/STEM/dd22823ed2b74e7aaff8fd0198c48b43.png?resizew=202)
(1)求证:
;
(2)求平面
与平面
所成的锐二面角的正弦值;
(3)在棱
上是否存在一点
,使得直线
与平面
所成的角为
,若存在,指出点
的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c5ae16a7145a28a91d45ef950a07c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/845d5c3f2067a8173a569003714282ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828554282008576/2830058682859520/STEM/dd22823ed2b74e7aaff8fd0198c48b43.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785546906851d56da452b46052eeb8a0.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558ce69401f3c97930f00ba0e2aa6647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558ce69401f3c97930f00ba0e2aa6647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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,正方形
和直角梯形
所在的平面互相垂直,四边形
是平行四边形,
为正方形
的中心,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573127072284672/1573127078617088/STEM/17126cbbac7e412296cbbc6ef11eeaf9.png)
(1)求证:
平面
;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70be49656c5446291ee51b45785d3aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22f3143a34f1f78bc5ef35c24d4beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334fec9ec91596bf9d2b41568123715f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfed6b5a2e5dfa673c66b118884ea8b4.png)
![](https://img.xkw.com/dksih/QBM/2016/11/4/1573127072284672/1573127078617088/STEM/17126cbbac7e412296cbbc6ef11eeaf9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94270844f197d524bf1da4f1385befd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf4235a8e7e2ef4df947f9c016525b9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4237f6a1fc115bb790aa10704b7908c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
您最近一年使用:0次