如图,在直角梯形
中,
,
,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/555158d7-5555-4e50-8c11-77dd93b022d9.png?resizew=300)
(1)求证:
;
(2)在直线
上是否存在点
,使二面角
的大小为
?若存在,求出
的长;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/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb270bca4c4f674ee1e56db5dfd3274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6341d610ae81c6438772fbacfc2a1657.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/555158d7-5555-4e50-8c11-77dd93b022d9.png?resizew=300)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d498c5bd6f0bc27ab2ebd2c003c666.png)
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a32a0fe258b74485e5b57891b4542c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
22-23高三上·四川绵阳·开学考试 查看更多[5]
四川省绵阳南山中学2022-2023学年高三上学期入学考试理科数学试题四川省巴中市通江中学2022-2023学年高二上学期10月月考理科数学试题河南省郑州市郑州外国语学校2022-2023学年高二上学期第一次月考数学试题湖南省怀化市2022-2023学年高二上学期期末数学试题(已下线)第6章:空间向量与立体几何 重点题型复习-【题型分类归纳】2022-2023学年高二数学同步讲与练(苏教版2019选择性必修第二册)
更新时间:2022-08-31 20:08:00
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相似题推荐
解答题-问答题
|
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解题方法
【推荐1】如图,矩形
中,
,
,将
沿直线BD折起至
,点E在线段AB上.
(1)若
平面
,求
的长;
(2)过点P作平面
的垂线,垂足为O,在
折起过程中,点O在
内部(包含边界),求直线
与平面
所成角正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/402e05c3-ca24-4ec3-841e-d1e35d2e7f7e.png?resizew=333)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)过点P作平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
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【推荐2】如图,在三棱锥
中,侧面
是锐角三角形,
,平面
平面
.
(1)求证:
;
(2)设
,点
在棱
(异于端点)上,当三棱锥
体积最大时,若二面角
大于
,求线段
长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/f7313c5c-2dba-4f87-addf-aeac67dd18ef.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350f50d5f781ef44ea8191535e41015f.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/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02535e1a690ca111ca7a395a1bf48080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐1】如图,
平面
,
,
,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2019/7/16/2247931161116672/2247957236981760/STEM/1791813d9e1b427c94cd33e68c37cc82.png?resizew=235)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc77e828650bc522b229a9d11e0197c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f01fb34062af96f8ba7e1e05fb5f862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24914bb2ddc7a5d0cb8772ea5fd31401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4568a33b56a5683c5bd4ff3a05fb32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e61dcea246d9be228d26796f59443bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2019/7/16/2247931161116672/2247957236981760/STEM/1791813d9e1b427c94cd33e68c37cc82.png?resizew=235)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69c2344dc6a9f77a169f2b320263418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fa442c18f1129caf84cb6ff4425fe4.png)
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解题方法
【推荐2】如图1,在
中,B=90°,AB=4,BC=2,D,E分别是边AB,AC的中点,现将
沿着DE折起,使点A到达点P的位置,连接PB,PC,得到四棱锥P-BCED,如图2所示,设平面
平面PBC=l.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/0524d440-fdb2-4c24-a860-1b54c9b09e8e.png?resizew=242)
(1)求证:
平面PBD;
(2)若点B到平面PDE的距离为
,求平面PEC与平面PBD夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f82c6d699f70abacefcbafc891d2005.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/0524d440-fdb2-4c24-a860-1b54c9b09e8e.png?resizew=242)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
(2)若点B到平面PDE的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐3】如图1所示,在矩形
中,
,
,
为
中点,将
沿
折起,使点
到点
处,且平面
平面
,如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/f5e24829-f48b-49ad-a589-31fde99cdcd1.jpg?resizew=381)
(1)求证:
:
(2)在棱
上取点
,使平面
平面
,求平面
与
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50244defdb202cc420e1d6a910241c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392469b357b12b998528499929366c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/f5e24829-f48b-49ad-a589-31fde99cdcd1.jpg?resizew=381)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186e5e7efe51fd25b9e38dc0fa23de9d.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c9831963e3d8ca278fbf96908b0075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
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