直角梯形
中,
,且
分别是边
上的点,沿线段 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52320bd8186f11ba9f8bb995ce7a339f.png)
将
翻折上去恰好使
重合于
.
![](https://img.xkw.com/dksih/QBM/2011/10/19/1570327604830208/1570327610048512/STEM/27363d9a9e4140609327de6a6c7c0e4d.png?resizew=361)
(I)求证:
;
(Ⅱ)已知
求二面角A-BC-D的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60add450a5ddb5b0f3cce4a560d2d0a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e573573982e79d6b63b497d53261872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5cb72419cdf0534283b7e54194ac392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52320bd8186f11ba9f8bb995ce7a339f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e54c44a087b005b43affcac82dbe06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fa157b4f65f3a9aa1f7f82de02e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2011/10/19/1570327604830208/1570327610048512/STEM/27363d9a9e4140609327de6a6c7c0e4d.png?resizew=361)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
(Ⅱ)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf633ce72112dadac724bebfa395e69f.png)
11-12高三上·浙江杭州·阶段练习 查看更多[1]
(已下线)2012届浙江省杭州十四中高三9月月考理科数学试卷
更新时间:2016-12-01 01:02:36
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在Rt△POA中
,将△POA绕边PO旋转到△POB的位置,使
,得到圆锥的一部分,点C为
的中点,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/d457a597-40f3-43f6-8d4e-64cc6f1fda12.png?resizew=122)
(1)求证:
:
(2)求点C到平面PAB的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5c239eef2d9abdafe0b0662fe2f514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e21aa38de80da8ccaa7ce51595e7bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/d457a597-40f3-43f6-8d4e-64cc6f1fda12.png?resizew=122)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
(2)求点C到平面PAB的距离.
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解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图,在长方体
中,
,点
是
的中点.
(1)证明:
;
(2)在棱
上是否存在一点
,使得
,若存在,求
,若不存在,说明理由;
(3)求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed1da7a28fb1983af25f2be2ed03cd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/f97a442c-bd91-4d3c-aee6-803c6ef163cb.png?resizew=172)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fa81c1f81266b4ef3d471bc6bfc38d.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9739242178b689d88a2831f9e55d9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb197a8a76cb7e66a0caf1b6ba2df54.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb4e4c148b9185e09e454955eaa7312.png)
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真题
【推荐3】如图,在直三棱柱
中,
,D是线段
的中点,P是侧棱
上的一点,若
,求
与底面
所成角的大小.(结果用反三角函数值表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd5a4a2b890cc93fdb9800915722fdbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70af2f51dc114eb028b11835485d5fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eb930d50f09942ab726441e5aa1d1d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/d83eed73-30d6-4235-9c7e-0e791dfb7169.png?resizew=150)
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名校
解题方法
【推荐1】如图,在三棱柱
中点,
在棱
上,点F在棱CC1上,且点
均不是棱的端点,
平面
且四边形
与四边形
的面积相等.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/0f0b168b-452f-46e9-9571-bf7a2ad07f37.png?resizew=188)
(1)求证:四边形
是矩形;
(2)若
,求平面
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbec5434bcf9173dfeebd92aa0c5070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a868f21b48fd1000dba000393add7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc1eb75f58efc0d6dd0fd3e66d10d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/0f0b168b-452f-46e9-9571-bf7a2ad07f37.png?resizew=188)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6480f384476190883f06c0289c7519.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd7f5ec2ccc1fb6569837da10d63739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
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【推荐2】如图,
为等腰直角三角形,
,D为AC上一点,将
沿BD折起,得到三棱锥
,且使得
在底面BCD的投影E在线段BC上,连接AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/88a89cc0-5ce1-4626-a42c-494e3ae0581c.png?resizew=362)
(1)证明:
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4f0c1c9cca0555906d8a53e1a6803d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4c18aba9681a8475968248764d4c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/88a89cc0-5ce1-4626-a42c-494e3ae0581c.png?resizew=362)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84be64d28b1623e71ad989f37336b1f2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2137127fa934ac4522f420217827b64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684fa1ca47841f97137ce9dad2f0e5de.png)
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