解题方法
1 . 如图,平面
平面
,四边形
和
都是边长为2的正方形,点
,
分别是
,
的中点,二面角
的大小为60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5544b738-f251-4406-a591-39165fd33071.png?resizew=190)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ec097d894a854d83946648f8b5fee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05b05f4f031889c7f5c0e1750804c9d.png)
![](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/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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03edbab2be470153ed4ebe16c25430b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5544b738-f251-4406-a591-39165fd33071.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab71ff19bd011f08cc4d379dde1b6eab.png)
您最近一年使用:0次
2020-03-21更新
|
517次组卷
|
3卷引用:2020届湖北省随州市高三下学期3月调研考试数学(文)试题
2 . 如图,平面
平面
,四边形
和
都是边长为2的正方形,点
,
分别是
,
的中点,二面角
的大小为60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/7b743585-6b2e-471c-a4a8-681903549ff5.png?resizew=155)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ec097d894a854d83946648f8b5fee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05b05f4f031889c7f5c0e1750804c9d.png)
![](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/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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03edbab2be470153ed4ebe16c25430b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/7b743585-6b2e-471c-a4a8-681903549ff5.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
您最近一年使用:0次
3 . 如图,三棱锥
中,
,
,点
,
分别是棱
,
的中点,点
是
的重心.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/2717a254-c0c8-474d-96e7-da8b40ad41a8.png?resizew=198)
(1)证明:
平面
;
(2)若
与平面
所成的角为
,且
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30fc65a72853bd8ac1ad0828270d3baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b88360883ff3aae1c331fab7ccf5b89.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/2717a254-c0c8-474d-96e7-da8b40ad41a8.png?resizew=198)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f7786539c4f5ff04a7b9d81518cc0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
您最近一年使用:0次
2020-01-10更新
|
555次组卷
|
2卷引用:湖北省宜昌一中、龙泉中学2020届高三下学期6月联考数学(文)试题
解题方法
4 . 如图,在四棱锥
中,
,
,
,
,
,
,
平面
,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/be9b660c-d38d-4fb0-9d68-3b6b59c84498.png?resizew=164)
(1)求证:平面
平面
;
(2)若直线
平面
,求此时三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923718ac7b296dd2c3b5b1d8ea0c3b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83c3f76bc7569c3c088da98bb3b2c50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/be9b660c-d38d-4fb0-9d68-3b6b59c84498.png?resizew=164)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9906ca0da086c36c05fe3e42cf373fe.png)
您最近一年使用:0次
5 . 如图四棱锥
中,底面
是正方形,
,
,且
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/2b51bf6c-93fb-4efc-9458-3b9f3468cb58.png?resizew=176)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](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/f0063f3f48e49f2970ec7f097567cef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37002ada5d194d4d062fa3285d7d9824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/2b51bf6c-93fb-4efc-9458-3b9f3468cb58.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a351d71fa01d3f5920e374a8ee7b524.png)
您最近一年使用:0次
2019-12-24更新
|
1478次组卷
|
10卷引用:【校级联考】湖北部分重点中学2020届高三年级新起点考试数学(理)试题
【校级联考】湖北部分重点中学2020届高三年级新起点考试数学(理)试题河北省邯郸市大名一中2019-2020学年高三上学期第一次月考数学(理)试卷山西省长治市第二中学校2019-2020学年高二上学期12月月考数学(理)试题2020届河南省许昌市高三年级第一次质量检测理科数学试题宁夏六盘山高级中学2019-2020学年高二上学期期末数学(理)试题广东省珠海市实验中学、东莞六中2020届高三上学期第二次联考理科数学试题2020届河南省中原名校高三上学期期末联考数学理科试题甘肃省天水市第一中学2019-2020学年高二下学期第一次学段考试数学(理)试题重庆市第八中学校2020-2021学年高二上学期期末数学试题广东省东莞高级中学2021届高三下学期3月模拟数学试题
名校
解题方法
6 . 如图,矩形ABCD中,
,
,点F、E分别是BC、CD的中点,现沿AE将
折起,使点D至点M的位置,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/db94a725-93b1-49fe-970f-36cb58b0f1e4.png?resizew=360)
(1)证明:
平面MEF;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1b9d577c1959f2c15b9823d06ba592.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/db94a725-93b1-49fe-970f-36cb58b0f1e4.png?resizew=360)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9300c0b886e2055bc658ddc18e132f6a.png)
您最近一年使用:0次
2020-03-21更新
|
322次组卷
|
6卷引用:【全国百强校】湖北省黄冈中学2019届高三第三次模拟考试数学(理)试题
7 . 如图,在三棱锥P﹣ABC中,PA⊥AB,PA=1,PC=3,BC=2,sin∠PCA
,E,F,G分别为线段的PC,PB,AB中点,且BE
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/492dc959-0255-417a-be03-e4e589afdb5a.png?resizew=153)
(1)求证:AB⊥BC;
(2)若M为线段BC上一点,求三棱锥M﹣EFG的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34efd0021d06e31448496f3673eb2a45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb6da35cb03b489e795ee5f6b612a11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/492dc959-0255-417a-be03-e4e589afdb5a.png?resizew=153)
(1)求证:AB⊥BC;
(2)若M为线段BC上一点,求三棱锥M﹣EFG的体积.
您最近一年使用:0次
名校
8 . 如图,在各棱长均相等的三棱柱
中,设
是
的中点,直线
与棱
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/a76b1e4b-9a45-43ce-938e-88f8fa857e3d.png?resizew=199)
(1)求证:直线
平面
;
(2)若
底面
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ecad355286188fd317939fa50f9555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/a76b1e4b-9a45-43ce-938e-88f8fa857e3d.png?resizew=199)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ae72f5e5891249caa10c43224da89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a45cf29c2dd5e427b26e071c8bd542.png)
您最近一年使用:0次
2020-03-16更新
|
181次组卷
|
2卷引用:2019届湖北省黄冈中学高三三诊理科数学试题
名校
解题方法
9 . 如图,在各棱长均相等的三棱柱
中,设
是
的中点,直线
与棱
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/91a889d7-7342-4293-91b9-91f27a442bda.png?resizew=166)
(1)求证:直线
平面
;
(2)若
,求证:侧面
底面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ecad355286188fd317939fa50f9555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/91a889d7-7342-4293-91b9-91f27a442bda.png?resizew=166)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ae72f5e5891249caa10c43224da89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab2a5f2db613c35928bbe15a6089c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df00cdf77ed39ca5a0b305861a693142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
名校
解题方法
10 . 如图所示,在四棱锥
中,底面
时直角梯形,
,
为等边三角形,平面
平面
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/5dd5c76d-c066-46ec-aa82-44d1f782bf53.png?resizew=217)
(1)证明:
;
(2)求点
到平面
的距离.
![](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/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8c12a6be7d9ec81631aca2c2b5074a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/5dd5c76d-c066-46ec-aa82-44d1f782bf53.png?resizew=217)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
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