在三棱柱ABC﹣A1B1C1中,AA1
底面ABC,
为正三角形,AB=AA1=2,E是BB1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/5230e9ec-a061-4cc9-9cb8-88e4d36e2841.png?resizew=133)
(1)求证:平面AEC1
平面AA1C1C;
(2)求二面角B﹣AC1﹣E的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/5230e9ec-a061-4cc9-9cb8-88e4d36e2841.png?resizew=133)
(1)求证:平面AEC1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)求二面角B﹣AC1﹣E的余弦值.
2021·湖北·模拟预测 查看更多[4]
湖北省2021届高三5月份高考数学联考试题新疆师范大学附属中学2022届高三9月月考数学(理)试题(已下线)专题04 立体几何-备战2022年高考数学母题题源解密(新高考版)(已下线)专题10 导数及其应用-备战2022年高考数学母题题源解密(新高考版)
更新时间:2021-07-08 12:14:05
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解答题-证明题
|
适中
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名校
解题方法
【推荐1】如图,在底面边长为
、高为
的正六棱柱
展厅内,长为
,宽为
的矩形油画
挂在厅内正前方中间.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/4b969611-1165-45d5-aa34-54928168d9ee.jpg?resizew=192)
(1)求证:平面
平面
;
(2)当游客
在
上看油画的纵向视角(即
)最大时,求
与油画平面所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e17ee14bd91bfff409c06fd434f6745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36b51b654efcff60d2d640b9b4c4471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858be9a2f30a22cfdebeaa5bf2e45b4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e17ee14bd91bfff409c06fd434f6745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4bc12df393ae4e3b99e1b986b5e9cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/4b969611-1165-45d5-aa34-54928168d9ee.jpg?resizew=192)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d08b2172115466f7bf49d79b109a8d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55d13f7c71af14cd070d16924329edc.png)
(2)当游客
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b4eea854f71c03b451cd3005119f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图长方体
中,
,
分别为棱
,
的中点
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/152f5f92-3c96-4c75-9adc-8014a107bc32.png?resizew=252)
(1)求证:平面
平面
;
(2)请在答题卡图形中画出直线
与平面
的交点
(保留必要的辅助线),写出画法并计算
的值(不必写出计算过程).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5f2391d09eba3db2299f29d2ec2674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d70de1ffdd9aa376b09bbcfa12644a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/152f5f92-3c96-4c75-9adc-8014a107bc32.png?resizew=252)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557e120c066e17ba3eee00410cbed573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1a1b7edecd3344707cf04ea3e86916.png)
(2)请在答题卡图形中画出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a7bcc1efb8a2ff57d64b6d057da463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a681d311a864d38cf306a0c137cbcca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff3e625ac13a1a25919cfd62862c1ad.png)
您最近一年使用:0次
解答题-证明题
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(0.65)
名校
【推荐1】如图,在
中,已知
,
在
上,且
,又
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/3778ecc7-55de-4a58-bd29-9b61752b2aaa.png?resizew=195)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0434c0177ca5c88ec129bd4cc13f4a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ef3be01299461baa7ae0210e94fb23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c77460acfd71305ba8118e5bd3f3d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31174a2b9ec37e8be84767a191f8f00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/3778ecc7-55de-4a58-bd29-9b61752b2aaa.png?resizew=195)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bceb05a36e24da2a422d0a11d64a69.png)
您最近一年使用:0次
解答题-问答题
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适中
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【推荐2】如图,在四棱锥P-ABCD中,底面ABCD为直角梯形,
,△PAD为等腰直角三角形,
,平面PAD⊥平面ABCD,E为CD的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/8339fb3d-caa9-47fb-b00c-d9e5e451cfa6.png?resizew=138)
(1)证明:EF//平面PAB;
(2)求平面AEF与平面PCD夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db69df3e45ee2b4b46d0ca3e2702b486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195c7dcafcc709f6dddc5af1cd67a1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ab555231268dc1d12ab9011423c5e21.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/8339fb3d-caa9-47fb-b00c-d9e5e451cfa6.png?resizew=138)
(1)证明:EF//平面PAB;
(2)求平面AEF与平面PCD夹角的余弦值.
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