在正方体
中,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/0b35b402-0ed7-4bc0-9f1f-18e33255a4a6.png?resizew=165)
(Ⅰ)求证:
平面
;
(Ⅱ)若正方体的棱长为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/0b35b402-0ed7-4bc0-9f1f-18e33255a4a6.png?resizew=165)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53cdc56590b42b154608b4cf19462fa0.png)
(Ⅱ)若正方体的棱长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66f1f881a41aac3869e202d8a89fc98.png)
21-22高三上·全国·阶段练习 查看更多[1]
(已下线)“超级全能生”2021届高三全国卷地区1月联考丙卷(B) 数学(文)试题
更新时间:2021-03-25 19:07:55
|
相似题推荐
【推荐1】如图,正三棱锥(底面是正三角形,侧棱长都相等)
的底面边长为2,侧棱长为3.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/98fd992c-9188-4189-a276-291f04b41e51.png?resizew=155)
(1)求正三棱锥
的表面积;
(2)求正三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/98fd992c-9188-4189-a276-291f04b41e51.png?resizew=155)
(1)求正三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
(2)求正三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
您最近一年使用:0次
【推荐2】如图,在四棱锥
中,底面四边形
为矩形,
,
,
,
,
平面
;
(2)若点
为
的中点,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0453cfd7e92bf7746a88280b9e7b580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc28e69c1ba0aac981256887f7dfa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c53e92421eb98578de84244d5d9ddbd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7ed85b76fb4c5e9a9a60bff4337742.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
解题方法
【推荐1】如图,在正方体
中,
与
交于点
,求证:
(1)直线
∥平面
;
(2)平面
∥平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/6/5c615a7d-218b-4f59-83e4-ed950f4eb5e8.png?resizew=154)
(1)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc6cec956fbd9d88b4ee1d3e2108334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
您最近一年使用:0次
【推荐2】如图,长方体
的底面是边长为
的正方形,高为
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974402399436800/2981488471146496/STEM/0a98d326-0c7e-4daf-b1a1-8d3304b29ceb.png?resizew=178)
(1)求三棱锥
的体积;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b199a99e53d67ff4abf233930961a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2070d3881b08d3e4405a0981d44854.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974402399436800/2981488471146496/STEM/0a98d326-0c7e-4daf-b1a1-8d3304b29ceb.png?resizew=178)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d58bf185026e4f6b568f1d5677074b.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de22059d7d80f24817235269e9bb1ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
解题方法
【推荐1】如图,四棱锥
的底面
是边长为2的正方形,
平面
,
,
分别是棱
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d863e2d7-5c18-4c47-af3f-ece955bd51b4.png?resizew=194)
(1)求证:
平面
;
(2)若
,求平面
将三棱锥
分成的两部分的体积中较大部分的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d863e2d7-5c18-4c47-af3f-ece955bd51b4.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
解题方法
【推荐2】如图,多面体
的直观图及三视图如图所示,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/1d19d4b9-0499-4dd9-8a26-40e6cf7c4bf6.png?resizew=256)
(1)求证:
平面
;
(2)求多面体
的体积;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c2b716be9d3fce8b00f088e3c4be55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/1d19d4b9-0499-4dd9-8a26-40e6cf7c4bf6.png?resizew=256)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982623c6129dd4c535b374c3526d93a6.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐3】在如图所示的几何体中,正方形
与梯形
所在平面相交,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/1e3705cf-bc51-44b3-9be2-f4544ea1df1c.png?resizew=175)
(1)证明:
平面
;
(2)若
平面
,试求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d525d8b43670233010b604ddf383b4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c56903f8f497bc868ef67bd3d8593d0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/1e3705cf-bc51-44b3-9be2-f4544ea1df1c.png?resizew=175)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2b5cfae407016cad45bbdefea05833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次