解题方法
1 . 如图,在正四棱柱ABCD-A1B1C1D1中,AA1=2AB,E、F分别为AA1、AC的中点.
(1)求证:EF∥平面CDA1B1;
(2)求EF与平面DBB1D1夹角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/439bde18-2a8f-4c0e-95eb-d9b5d082495b.png?resizew=113)
(1)求证:EF∥平面CDA1B1;
(2)求EF与平面DBB1D1夹角的余弦值.
您最近一年使用:0次
2 . 在
中,
分别为
的中点,
,如图①,以
为折痕将
折起,使点A到达点
的位置,如图②.
(1)证明:
;
(2)若
平面
,求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a204736186742e998dd00acff244a3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/22/24978418-52bc-4570-ad0f-3fad43683187.png?resizew=351)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b05b2c4d1a2d7ccacd254f9f60ddd5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f1bb063892dfd8f301d327e2f68feb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b489c25405ce48699d4f0a62820bed.png)
您最近一年使用:0次
名校
解题方法
3 . 在
中,
分别为
的中点,
,如图①,以
为折痕将
折起,使点A到达点P的位置,如图②.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/22/ab8085ba-21f0-4cb4-b005-ab6bf13e3da2.png?resizew=291)
(1)证明:
;
(2)若
平面
,且
,求点C到平面
的距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a204736186742e998dd00acff244a3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/22/ab8085ba-21f0-4cb4-b005-ab6bf13e3da2.png?resizew=291)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b05b2c4d1a2d7ccacd254f9f60ddd5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f1bb063892dfd8f301d327e2f68feb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
您最近一年使用:0次
2023-05-21更新
|
896次组卷
|
5卷引用:新疆维吾尔自治区阿勒泰地区2023届高三三模数学(文)试题
名校
4 . 如图,在四棱锥
中,
,
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/4843957b-9858-4465-bcf8-55ad7be977f2.png?resizew=212)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
平面
;
(2)若平面
平面
,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/b63b504a1086dde6360cb40bb9ea32e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fddc6faf2ebb390cd7fa7de4d315c810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/4843957b-9858-4465-bcf8-55ad7be977f2.png?resizew=212)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若平面
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
2023-05-18更新
|
1016次组卷
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4卷引用:新疆巴音郭楞蒙古自治州若羌县中学2024届高三上学期6月摸底考后强化数学试题
5 . 如图,在正三棱柱ABC-A1B1C1中,AA1⊥平面ABC,D、E分别为AC、AA1的中点,AC=AA1=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/c4ab31ba-017a-443d-bb4c-198aca6429d9.png?resizew=121)
(1)求证:DE∥平面A1BC;
(2)求DE与平面BCC1B1夹角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/c4ab31ba-017a-443d-bb4c-198aca6429d9.png?resizew=121)
(1)求证:DE∥平面A1BC;
(2)求DE与平面BCC1B1夹角的余弦值.
您最近一年使用:0次
名校
6 . 如图,在四棱锥
中,底面ABCD为正方形,
平面ABCD,M,N分别为棱PD,BC的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/3a438676-f6ad-42ec-a05b-416826f1dff2.png?resizew=141)
(1)求证:
平面PAB;
(2)求直线MN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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/3a438676-f6ad-42ec-a05b-416826f1dff2.png?resizew=141)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
(2)求直线MN与平面PBD所成角的正弦值.
您最近一年使用:0次
2023-05-14更新
|
745次组卷
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4卷引用:新疆生产建设兵团第三师图木舒克市第一中学2022-2023学年高一下学期6月月考数学试题
解题方法
7 . 如图,三棱柱
的所有棱长均为1,且点
在底面上的射影是AC的中点D.
与
交于点E,
与
交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/2dd38a9a-4563-428c-997e-476bbce54d07.png?resizew=208)
(1)证明:
;
(2)求几何体ABCFE的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/2dd38a9a-4563-428c-997e-476bbce54d07.png?resizew=208)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f35646cb29fafd1e1a214b69e4f22d.png)
(2)求几何体ABCFE的体积.
您最近一年使用:0次
2023-05-03更新
|
347次组卷
|
2卷引用:新疆乌鲁木齐市等5地2023届高三高考第二次适应性检测数学(文)试题
解题方法
8 . 在
中,
,
,过点A作
,交线段BC于点D(如图1),沿AD将
折起,使
(如图2)点E,M分别为棱BC,AC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/29/95b555c6-55f4-4d0e-abca-754e543a6214.png?resizew=256)
(1)求证:
;
(2)求三棱锥
的体积最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/29/95b555c6-55f4-4d0e-abca-754e543a6214.png?resizew=256)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73038c8fab9ef31d42b3ee0631b3dd1c.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
您最近一年使用:0次
名校
解题方法
9 . 在
中,
,
,过点
作
,交线段
于点
(如图1),沿
将
折起,使
(如图2),点
,
分别为棱
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/29/c5569b5d-42e9-4390-ac4e-c5882ee4141e.png?resizew=326)
(1)求证:
;
(2)当三棱锥
的体积最大时,试在棱
上确定一点
,使得
,并求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/29/c5569b5d-42e9-4390-ac4e-c5882ee4141e.png?resizew=326)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73038c8fab9ef31d42b3ee0631b3dd1c.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5448218bd8c5b4f4a3714e0b0292d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f8bee68df4d2f8bdcd86cde8b91450.png)
您最近一年使用:0次
2023-04-28更新
|
373次组卷
|
4卷引用:新疆维吾尔自治区乌鲁木齐市2023届高三三模数学(理)试题
新疆维吾尔自治区乌鲁木齐市2023届高三三模数学(理)试题(已下线)安徽省“江南十校”2023届高三下学期3月一模数学试题变式题17-22湖南省郴州市嘉禾县第六中学2022-2023学年高二下学期第二次月考数学试题甘肃省天水市第一中学2022-2023学年高二下学期第一学段考(5月)数学试题
10 . 如图,已知三角形
是等腰三角形,
,
,
,
分别为
,
的中点,将
沿
折到
的位置如图2,且
,取线段
的中点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/d24b0ca2-1c80-4a4f-958e-62ba4a013730.png?resizew=247)
(1)求证:
平面
;
(2)求点
到面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d7c0126e753ca02dbab9c41829d31e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99b994835978bf95118d74885133a94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da4da3fe00569551b54fd3c9ee28864.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/ad895b1c422b40c35be89c8bef22e834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca15691dfea154b932004966f2fbca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94e59ad6695d077e3f31d330d5734.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/d24b0ca2-1c80-4a4f-958e-62ba4a013730.png?resizew=247)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
您最近一年使用:0次
2023-04-25更新
|
670次组卷
|
2卷引用:新疆喀什地区普通高考2023届高三适应性检测数学(文)试题