如图,在直三棱柱
中,
,
是面积为
的正方形,且
与平面
所成的角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/a423e6ce-c2d8-41d2-925e-2ad467b9332d.png?resizew=163)
(1)求三棱柱
的体积;
(2)若
为棱
上靠近
的三等分点,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61dedee1850194d45fb23f52c72da94d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37f1ae8a2cf694c98fa3afd5b57e435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/a423e6ce-c2d8-41d2-925e-2ad467b9332d.png?resizew=163)
(1)求三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61dedee1850194d45fb23f52c72da94d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1a1b7edecd3344707cf04ea3e86916.png)
更新时间:2023-04-15 12:37:09
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,圆柱
的底面圆半径为
,
为经过圆柱轴
的截面,点
在
上且
,
为
上任意一点.
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370732458287104/2370789363023872/STEM/33cb5b6fb0bf4329b86fe75c2ed9d704.png?resizew=189)
(1)求证:
;
(2)若直线
与面
所成的角为
,求圆柱
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d77b3ca5de6584c7d4ca5fdafbb8d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50081ec1e64530e465104a2f2bbb3f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370732458287104/2370789363023872/STEM/33cb5b6fb0bf4329b86fe75c2ed9d704.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2180eeee8897d83729ccf0916456b726.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
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解题方法
【推荐2】平行四边形ABCD中,∠A
,2AB=BC,E,F分别是BC,AD的中点.将四边形DCEF沿着EF折起,使得平面ABEF⊥平面DCEF,得到三棱柱AFD﹣BEC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/7b7cb5b7-9de8-48d6-a06e-5e9aadf3c1a4.png?resizew=377)
(1)证明:DB⊥EF;
(2)若AB=2,求三棱柱AFD﹣BEC的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3052da2d1bc23ddce31da1fbe42a6f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/7b7cb5b7-9de8-48d6-a06e-5e9aadf3c1a4.png?resizew=377)
(1)证明:DB⊥EF;
(2)若AB=2,求三棱柱AFD﹣BEC的体积.
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【推荐1】如图,
是半圆
的直径,平面
与半圆
所在的平面垂直,
,
,
,
是半圆
上不同于
,
的点,四边形
是矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/3d2a5411-b968-4822-be91-4dead2b9d707.png?resizew=109)
(Ⅰ)若
,证明:
平面
;
(Ⅱ)若
,求三棱锥
体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88df253c627c579756fd064c90c1dfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d4810173d7a9e83e226beb43099ed1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/3d2a5411-b968-4822-be91-4dead2b9d707.png?resizew=109)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75929268210da5976bc37d080da030dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147e7c8ba0bbb540a712f6eb2ed6d22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa711919d767a88b15c3f6dd7fd809a5.png)
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解答题-证明题
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解题方法
【推荐2】如图,四边形ABCD与BDEF均为菱形,FA=FC,且∠DAB=∠DBF=60°.
(2)若菱形BDEF边长为2,求三棱锥E-BCD的体积.
(2)若菱形BDEF边长为2,求三棱锥E-BCD的体积.
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【推荐1】如图所示,PA⊥平面ABC,点C在以AB为直径的⊙O上,∠CBA=30°,PA=AB=2,点E为线段PB的中点,点M在弧AB上,且OM∥AC.
![](https://img.xkw.com/dksih/QBM/2014/5/20/1571731454509056/1571731460161536/STEM/ae8a422d-f7ba-47f2-948f-b735285d40d9.png)
(1)求证:平面MOE∥平面PAC;![](https://img.xkw.com/dksih/QBM/2015/3/4/1571990346170368/1571990352011264/STEM/d794b97de9ae447494aeb8f66ab45ffc.png?resizew=12)
(2)求证:平面PAC⊥平面PCB;
(3)设二面角M-BP-C的大小为θ,求cosθ的值.
![](https://img.xkw.com/dksih/QBM/2014/5/20/1571731454509056/1571731460161536/STEM/ae8a422d-f7ba-47f2-948f-b735285d40d9.png)
(1)求证:平面MOE∥平面PAC;
![](https://img.xkw.com/dksih/QBM/2015/3/4/1571990346170368/1571990352011264/STEM/d794b97de9ae447494aeb8f66ab45ffc.png?resizew=12)
(2)求证:平面PAC⊥平面PCB;
(3)设二面角M-BP-C的大小为θ,求cosθ的值.
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【推荐2】在正方体
中,E为
的中点,F为直线
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/b27a1724-a160-4a97-93d3-7ba950164955.png?resizew=164)
(1)若
,求平面AEF与平面
的夹角的正切值;
(2)若
,P为底面ABCD的中心,当点P到平面AEF的距离为
时,求线段CF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/b27a1724-a160-4a97-93d3-7ba950164955.png?resizew=164)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f87ac1824dc21b14046dc4ed2c98c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9409d443e7a883cce463cd38b607c6a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aace91caec728e174daec29a3568ae.png)
您最近一年使用:0次