如图,在多面体
中,四边形
是边长为4的菱形,
与
交于点
,平面
平面
.
平面
;
(2)若
,点
为
的中点,求二面角
的余弦值.
![](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/0f99ac87ae0d092f37a0c21f228c0f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d740c5dcc2122cb8767b512abb429f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ecebae8b8670341d51638398ab373d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9de7ea432599108b34a0ccaa0f2c75e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80537d6b40787641ea2e59df6d1dbb50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01ad3fe1fcfd32718b835249326d2e1.png)
22-23高三下·河北·阶段练习 查看更多[4]
河北省2023届高三下学期高考前适应性考试数学试题广西南宁市第三中学2022-2023学年高二下学期期中考试数学试题(已下线)2.4.3 向量与夹角(同步练习)-【素养提升—课时练】2022-2023学年高二数学湘教版选择性必修第二册检测(基础篇)安徽省芜湖市第一中学2022-2023学年高三下学期4月统测数学试卷
更新时间:2023-03-26 17:19:50
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知四边形
是边长为
的正方形,
平面
,
,且
,
,
,
,建立空间直角坐标系,如图所示.
![](https://img.xkw.com/dksih/QBM/2017/5/9/1683233566711808/1687403012866048/STEM/65f04c24c1614430a4426c45a00042bb.png?resizew=147)
(Ⅰ)在平面
内求一点
,使
平面
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.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/e144509fb7e2cf5f696b7a3a9beacd34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1a56baf43ffdf67bc8460856e31fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fd676c41d2d644928f014b0fea4689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c122ca7141c43c15c783968f5f0dbc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4893fbcb191420e06a239e63493626f5.png)
![](https://img.xkw.com/dksih/QBM/2017/5/9/1683233566711808/1687403012866048/STEM/65f04c24c1614430a4426c45a00042bb.png?resizew=147)
(Ⅰ)在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cbaf84a889666deb1fe3ca86a7a85e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3897359e55f0cfb8620d4f7b864ddbc.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c77ad1184f8da3061c13fd1a2f851a.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,在多面体ABCDEF中,平面
平面ABCD,四边形CDEF是矩形,四边形ABCD是平行四边形,
,
,G,H分别为CF,DE的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/226a6cf3-7347-402c-8696-e4014a33f3a4.png?resizew=119)
(1)证明:
平面BDE;
(2)求点D到平面BEG的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a68a008a22d5a8cea5fe8dcf31e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c642331515a1930624bb6ab985178af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/226a6cf3-7347-402c-8696-e4014a33f3a4.png?resizew=119)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d07d16fc91aa960b67ba4b474de8a62.png)
(2)求点D到平面BEG的距离.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,四棱锥
中,底面
是边长为2的正方形,
,
,且
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941239547174912/2943103781117952/STEM/4f1ea8ce11fd4cc2aae201d7ec1ce513.png?resizew=242)
(1)求平面
与平面
夹角的余弦值;
(2)在线段
上是否存在点
,使得点
到平面
的距离为
?若存在,确定点的位置;若不存在,请说明理由.
![](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/f0063f3f48e49f2970ec7f097567cef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37002ada5d194d4d062fa3285d7d9824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941239547174912/2943103781117952/STEM/4f1ea8ce11fd4cc2aae201d7ec1ce513.png?resizew=242)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1dcba40b263c1119ea0a36651c7812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69d166677557cadb3da32b4a7e152e3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】已知四面体ABCD,D在面ABC上的射影为
,
为
的外心,
,
.
(1)证明:BC⊥AD;
(2)若E为AD中点,OD=2,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79faaf0e895a5e3edf40756d990e1161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/5a52cbb1-69b4-4e70-b773-e3b963b6bae7.png?resizew=136)
(1)证明:BC⊥AD;
(2)若E为AD中点,OD=2,求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ef8395c1f528613bcf683cfe9dc1a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac901ff434c379e158fccd64dc6401f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐3】如图,已知梯形
中,
,
,四边形
为矩形,
,平面
平面
.
平面
;
(2)求平面
与平面
的夹角的余弦值;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b82877dc58dc6ec36e54de3f1e252b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1e2c273d6413383af978b52b1cd64f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ea464a0929a33bedd2ee95cdb66ba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2b5cfae407016cad45bbdefea05833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daec02423dbc4bf84b8ec462d12b683.png)
您最近一年使用:0次