如图,四边形
是菱形,且
,P是平面
外一点,
为正三角形,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962141999013888/2962853384200192/STEM/88010877-c028-4fc9-9554-52a4d1657025.png?resizew=180)
(1)若G为边
的中点,求证:
平面
;
(2)若E为边BC的中点,能否在边PC上找出一点F,使平面
平面
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962141999013888/2962853384200192/STEM/88010877-c028-4fc9-9554-52a4d1657025.png?resizew=180)
(1)若G为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf65b8884909d735d575efe81a2d2ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若E为边BC的中点,能否在边PC上找出一点F,使平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6dd051db98c531f9ef18cdfd793f4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
21-22高二·全国·课后作业 查看更多[4]
沪教版(2020) 必修第三册 达标检测 第10章 10.4 平面与平面的位置关系河南省濮阳市第一高级中学2021-2022学年高一下学期期中理科数学试题江西省景德镇一中2021-2022学年高一(19班)下学期期末考数学试题(已下线)第8章立体几何初步(基础、典型、易错、压轴)分类专项训练
更新时间:2022-04-21 11:23:33
|
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】在斜三棱柱
中,△ABC是边长为2的正三角形,侧棱
,顶点
在面ABC的射影为BC边的中点O.
![](https://img.xkw.com/dksih/QBM/2022/4/11/2955926548725760/2956560370229248/STEM/53950a70e6a04e0dbba07ab78a9b0d15.png?resizew=289)
(1)求证:面
⊥面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d0cba2f1c74d7cdf4eefdd665d4357.png)
(2)求面ABC与面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a243eafad1f352a8b3ac805c3ec5c6e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038a54be63c6c007b380bc862b0b14d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/2022/4/11/2955926548725760/2956560370229248/STEM/53950a70e6a04e0dbba07ab78a9b0d15.png?resizew=289)
(1)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545decfe4dd2dcf6f24da7363c1bd023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d0cba2f1c74d7cdf4eefdd665d4357.png)
(2)求面ABC与面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3636b407d8818e15891e18db47fa0c9e.png)
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适中
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解题方法
【推荐2】如图,四棱锥
中,四边形
是矩形,
,
为正三角形,且平面
平面
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/14a2be5f-c420-4046-b1b0-79e9f4690e9b.png?resizew=202)
(1)证明:平面
平面
;
(2)求二面角
的余弦值.
![](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/f244ef888403bc498637ab74e46ff611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/14a2be5f-c420-4046-b1b0-79e9f4690e9b.png?resizew=202)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9367449a5847eade07e69f4feddcb027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053932dc8c5eebbc739256cb4de6c71d.png)
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名校
解题方法
【推荐1】如图,在五面体
中,四边形
是边长为4的正方形,
,平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
平面
,且
,
,点G是EF的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/108c495f-cfa5-403b-8c38-fec5ed75e0a4.png?resizew=156)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
平面
;
(2)若直线BF与平面
所成角的正弦值为
,求
的长;
(3)判断线段
上是否存在一点
,使
平面
?若存在,求出
的值;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/6bb5f97d47fbb49fcfcdc7f5e882a80b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee170c82e3dc624dc3016443496a469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/108c495f-cfa5-403b-8c38-fec5ed75e0a4.png?resizew=156)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若直线BF与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec42ae1010746324df9d5d883413526.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
(3)判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca10800c94228d218f9048a8502a6dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f6039eb12b502683fa787718600206.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】如图,在四棱锥
中,底面
是边长为4的菱形,
,
,点E在线段
上,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/364e7f96-352b-4dec-a8bd-3f5a023f26d7.png?resizew=191)
(1)求
;
(2)求直线
与平面
所成角的正弦值.
![](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/5918807712bab71325f3a79661d2ea4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb52f9b226b1db3f6f9f055948bd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/364e7f96-352b-4dec-a8bd-3f5a023f26d7.png?resizew=191)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d41989d897ddb0fe7aa59f3beaabf9.png)
您最近一年使用:0次