名校
解题方法
1 . 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/2023/3/29/af1034bc-5ab5-4b98-9116-da4bc36f5d26.png?resizew=378)
(1)求证:
;
(2)在①图1中
,②图1中
,③图2中三棱锥
的体积最大.
这三个条件中任选一个,补充在下面问题中,再解答问题.
问题:已知__________,试在棱
上确定一点
,使得
,并求平面
与平面
的夹角的余弦值.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16770045e02c32c6b246f1e88c580647.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/d1347b1707478d309af4287a00e852b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5889e1f093f2c35273d3132ef8434e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/af1034bc-5ab5-4b98-9116-da4bc36f5d26.png?resizew=378)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73038c8fab9ef31d42b3ee0631b3dd1c.png)
(2)在①图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e84ed4d1ef85e452a30c6b8f7981b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1371c97ec3d0ea7b3ef979f5538d330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
这三个条件中任选一个,补充在下面问题中,再解答问题.
问题:已知__________,试在棱
![](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/212a67f115d1cbe69f100b489babe5f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5ce42fe8ea626c297e3b2a2ab95149.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
2023-03-28更新
|
1239次组卷
|
6卷引用:四川省内江市2023届高三第三次模拟考试数学(理科)试题
四川省内江市2023届高三第三次模拟考试数学(理科)试题湖南省岳阳市2023届高三下学期二模数学试题(已下线)专题07立体几何的向量方法专题16空间向量与立体几何(解答题)(已下线)专题06 立体几何 第一讲 立体几何中的证明问题(分层练)宁夏银川一中2022-2023学年高二下学期期中考试数学(理)试题
名校
解题方法
2 . 圆柱
中,四边形
为过轴
的截面,
,
,
为底面圆
的内接正三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/026f0a8f-416d-493d-a7f4-421edb8b6065.png?resizew=189)
(1)证明:
平面
;
(2)求平面
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b30ab3e9dda0c794ce649cc959a5d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d37160545bf07e848d23fca6a7b1da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd81adb13f5a7550b0f94f770900a613.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/026f0a8f-416d-493d-a7f4-421edb8b6065.png?resizew=189)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3267664e1d0a09def7c38743f0193f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a34fdf9e6d2d87d01ad0bbb6a73ee05.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7495688c046142f688c822209c0e968e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a34fdf9e6d2d87d01ad0bbb6a73ee05.png)
您最近一年使用:0次
2023-03-26更新
|
352次组卷
|
2卷引用:四川省宜宾市2023届高三下学期第二次诊断性测试理科数学试题
名校
解题方法
3 . 如图,在三棱锥
中,三条侧棱OA,OB,OC两两垂直,且
,M为
内部一动点,过M分别作平面OAB,平面OBC,平面OAC的垂线,垂足分别为P,Q,R.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974506010230784/2975624099708928/STEM/2b11d325-7f6d-4c17-85a9-065fc761d527.png?resizew=271)
①直线PR与直线BC是异面直线;
②
为定值;
③三棱锥
的外接球表面积的最小值为
;
④当
时,平面PQR与平面OBC所成的锐二面角为45°.
则以上结论中所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbab39da847da8a559994b6c6004aa60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974506010230784/2975624099708928/STEM/2b11d325-7f6d-4c17-85a9-065fc761d527.png?resizew=271)
①直线PR与直线BC是异面直线;
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b4389530f4d31bc0ae46d0edfcdd2dd.png)
③三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64bab74dadb5557a3762947e52feb532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4966e5af166b69a0a38a98abf555b6b.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38db6f3badb51bef6fa220ce110af854.png)
则以上结论中所有正确结论的序号是
您最近一年使用:0次
2022-05-09更新
|
514次组卷
|
3卷引用:四川省南充市2022届高三下学期高考适应性考试(三诊)数学(理)试题
名校
4 . 如图,在圆锥
中,
为底面圆的直径,
为底面圆上两点,且四边形
为平行四边形,过点
作
,点
为线段
上一点,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/c8bcd9c6-b9f8-44f4-87b6-5fc45c4d0d57.png?resizew=174)
(1)证明:
平面
;
(2)若圆锥
的侧面积为底面积的2倍,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba00756582afde4e4e75f4a2b189295b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451557ef624a9c142ebc5fa155e0e28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6c4037c6d20d251e94dc2730b0dad1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/c8bcd9c6-b9f8-44f4-87b6-5fc45c4d0d57.png?resizew=174)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
(2)若圆锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15774872dbe4d9f2c16b997299451f46.png)
您最近一年使用:0次
2022-02-09更新
|
1292次组卷
|
4卷引用:四川省泸州市泸县第二中学2022届高三下学期二诊模拟考试数学(理)试题
名校
解题方法
5 . 如图1,在
中,
,过点A作
,垂足
在线段
上,沿
将
折起,使
(图2),点
分别为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2022/2/16/2917867928952832/2921885495640064/STEM/8999d854b863426f94ab6e0e44986f33.png?resizew=442)
(1)求证:
;
(2)已知_____(在后面三个条件中任选一个,补充在横线上),试在棱
上确定一点
,使得
,并求二面角
的余弦值(如果选择多个条件分别解答,按第一个解答计分).
条件①:图1中
;
条件②:图1中
;
条件③:图2中三棱锥
的体积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94efa5055d28df98174c70468f691e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/587458141d890533c0c32aa249a27ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9ea567f329fd06508903a815f71561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887721a843b2dc8e947cc42d09868e33.png)
![](https://img.xkw.com/dksih/QBM/2022/2/16/2917867928952832/2921885495640064/STEM/8999d854b863426f94ab6e0e44986f33.png?resizew=442)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73038c8fab9ef31d42b3ee0631b3dd1c.png)
(2)已知_____(在后面三个条件中任选一个,补充在横线上),试在棱
![](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)
条件①:图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30a050eb958818c6b6de98640c943df1.png)
条件②:图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae053beafc8a7007f6127407d6ce6fd.png)
条件③:图2中三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
您最近一年使用:0次
2022-02-22更新
|
590次组卷
|
3卷引用:四川师范大学附属中学2022届高三二诊二模考试理科数学试题
四川师范大学附属中学2022届高三二诊二模考试理科数学试题(已下线)第四章 立体几何解题通法 专题二 升维法 微点3 升维法综合训练【培优版】重庆市暨华中学校2021-2022学年高二上学期10月月考数学试题