如图所示的几何体中,四边形
是等腰梯形,
,
,
平面
,
,
.
(1)求平面
与平面
夹角的余弦值;
(2)在线段
(含端点)上,是否存在一点P,使得
平面
.若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b5a90e556da12d63b7f481bd8e874c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfd2256428e748c07e743e751d26480.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/2ff7a58b-2107-4d3d-b745-ab70357bd14e.png?resizew=150)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac93e58e9bba899df62a4cda5f1a5ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f1d7219cd40346442b33dba84deb5c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e04d30b126e9edbfc0b6036feff1a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ab40260ac9056153d14d70d2519371.png)
更新时间:2023-09-25 18:04:52
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,底面ABCD为菱形,
,
,
,
,
,且
.
.
(2)若
,求直线PA与平面PBD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4014edd5ca7ddd954507ab87eb2638e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c397bc7f7b3de2c8182c3fbe94fd5ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade0c328cc3442c26e5bf33d9134c071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967acbdcaff72b127bc6b27afffefb04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f523d89b2aa3d1e97628c7c670eac13a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9829fc6685b59fdc609f32f30ebd9e6d.png)
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解答题-证明题
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适中
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名校
解题方法
【推荐2】如图,在直三棱柱
中,
,
,
,M是
的中点,N是
中点.
![](https://img.xkw.com/dksih/QBM/2020/4/30/2452887344840704/2457483056234496/STEM/e56a53f56c514920972d740d09b4e187.png?resizew=136)
(1)求证:
∥平面
;
(2)求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf90bac174f02c4552e56df4d910bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://img.xkw.com/dksih/QBM/2020/4/30/2452887344840704/2457483056234496/STEM/e56a53f56c514920972d740d09b4e187.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f491a794b9ac1a85a18c87ecee616c.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1】四棱锥
中,底面
是矩形,
平面
为
中点,
.
(1)求
;
(2)求二面角
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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88a8cd65b3c75d5b77b0da0f45c1cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/799aab22-2920-4d18-b6c8-eef980b038ee.png?resizew=157)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7767186dae5486fe4ca50359185c0b0.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在多面体
中,梯形
与平行四边形
所在平面互相垂直,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/173434cf-cfa5-4082-9693-b5ff7435fb37.png?resizew=184)
(Ⅰ)求证:
;
(Ⅱ)求二面角
的余弦值;
(Ⅲ)判断线段
上是否存在点
,使得平面
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/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15cd53fe7b73365723ce4789bb259d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8225b3e02f5a9f1fd5a09ada650cb78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4151e948feebdf7b91fbe739feafa9bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb673275c8a3cf9a12086b7661018d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/173434cf-cfa5-4082-9693-b5ff7435fb37.png?resizew=184)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fa7ff056747ebdc342dc2ddf1b4b16.png)
(Ⅲ)判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2391a9a120579db62c6adec2d8286a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fa6b0921ac2aabed4c310cbb377a2f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在多面体
中,四边形
是矩形,
为等腰直角三角形,且
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728772269850624/2731651711229952/STEM/af692241697b4fd09252f5f07783f423.png?resizew=145)
(1)求证:平面
平面
;
(2)线段
上存在点
,使得二面角
的大小为
,试确定点
的位置并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb64353c99068a7a1a8508a22f5b25b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5a2eb4bd5e40825dad3019e98014f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728772269850624/2731651711229952/STEM/af692241697b4fd09252f5f07783f423.png?resizew=145)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502f49e759b623b5c3a8b901bb9882cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,四棱锥
,
平面
,且
,
,
,
是边长为2的正三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/52b2ba09-5d95-422c-9df5-6bca30c803ea.png?resizew=212)
(1)求证:
平面
;
(2)求平面
与平面
夹角的余弦值;
(3)线段
上是否存在点E,使得
与平面
所成角的正弦值为
,若存在,请指出点E的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485cb82d13baf885b44d6616826c54e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606c6e9fb76e8cab206af9bfd3030dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1772fcf5995e63876fe258e38cfbdb03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/52b2ba09-5d95-422c-9df5-6bca30c803ea.png?resizew=212)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aace91caec728e174daec29a3568ae.png)
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