在四棱锥
中,底面
是矩形,
分别是棱
的中点.
(1)证明:
平面
;
(2)若
平面
,且
,
,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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19935e386ac54c8257a4b9ea0bd9d7a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/3fec773f-af5d-429c-be62-269b5c3f68ec.png?resizew=159)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f70cf3f6c7acbf60d4a4ca0ce89619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
(2)若
![](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/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62526e69e7c4e59d9df8a5b2c2426400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8981acad5791c9037b86779e4d8323.png)
22-23高二下·贵州黔东南·期末 查看更多[7]
贵州省黔东南州2022-2023学年高二下学期末文化水平测试数学试题湖南省长沙市明德中学2023-2024学年高三上学期入学考试数学试题福建省宁德市福鼎市第一中学2024届高三上学期第一次考试数学试题广东省普宁市勤建学校2024届高三上学期第二次调研数学试题(已下线)广东省广州市中山大学附属中学2024届高三上学期期中数学试题变式题19-22(已下线)艺体生一轮复习 第七章 立体几何 第36讲 空间向量在立体几何中的应用【练】(已下线)专题06 用空间向量研究距离、夹角问题10种常见考法归类 - 【考点通关】2023-2024学年高二数学高频考点与解题策略(人教A版2019选择性必修第一册)
更新时间:2023-07-16 13:04:40
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解答题-证明题
|
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【推荐1】在正方体
中,E、F分别是棱AB、CD的中点.
(1)求证:
面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/10/289e7d9c-2de6-436d-85f7-e4b322fcfe59.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185729402f3b20ac3e0b003be9b385eb.png)
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【推荐2】如图,在长方体
中,
为
中点.
![](https://img.xkw.com/dksih/QBM/2021/1/30/2647463152123904/2650369001906176/STEM/f058d553e3ed44bc82768d523235f408.png?resizew=163)
(1)求证:
平面
;
(2)若
,
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/2021/1/30/2647463152123904/2650369001906176/STEM/f058d553e3ed44bc82768d523235f408.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1496afecd92a619fbe5e9b736f06f4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9719106739f03e86b521771a260803.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480f4df0a32a910db7d39695ffd86665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9719106739f03e86b521771a260803.png)
您最近一年使用:0次
解答题-证明题
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较易
(0.85)
名校
解题方法
【推荐3】如图,在四棱锥P-ABCD中,底面ABCD为平行四边形,E为侧棱PA的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634443043160064/2688890705534976/STEM/80916ad690d141ffad8048728ea66a54.png?resizew=168)
(1)求证:PC//平面BDE;
(2)若PC⊥PA,PD=AD,求证:PA⊥平面BDE.
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634443043160064/2688890705534976/STEM/80916ad690d141ffad8048728ea66a54.png?resizew=168)
(1)求证:PC//平面BDE;
(2)若PC⊥PA,PD=AD,求证:PA⊥平面BDE.
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解答题-问答题
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【推荐1】如图,在三棱锥
中,
是边长为4的正三角形,
,
,
分别为
,
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/8ba697c3-09b7-426d-be73-52d0c2064a3a.png?resizew=162)
(1)证明:
平面ABC;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ca6072b3a2aac406a2b60bb7e01cde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea27e2052fcaae1f3312f62bd90f86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/8ba697c3-09b7-426d-be73-52d0c2064a3a.png?resizew=162)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d30637da200a07672ae231b4c5c09cd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0262d3168bd3296cc63c4d78965cbb2c.png)
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解答题-问答题
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解题方法
【推荐2】如图,在四棱锥
中,
平面
,
,
,
,
,
为棱
的中点,直线
与
所成角的余弦值为
.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/f1d3202d-1d1a-402e-adae-7d7dc6a13f0d.png?resizew=143)
(1)点
到直线
的距离;
(2)二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c4340dcffb0783d118a587e5352a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f2b1e0f812dabeda280d82b1eaa00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e126b2b77b9b894dd7e7de69d72cf527.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/f1d3202d-1d1a-402e-adae-7d7dc6a13f0d.png?resizew=143)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98553247801c03de24cf7e687016e655.png)
您最近一年使用:0次
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名校
【推荐3】如图,四边形
是正方形,
平面
,F为
的中点D.
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847649610473472/2898589790535680/STEM/bc20efbc-7479-4042-9798-a99c09bfa65f.png?resizew=212)
(1)求证:
;
(2)求证:
∥平面
;
(3)求面
与面
夹角的大小.
![](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/db3c66a303b974d61e178eea90c6896c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847649610473472/2898589790535680/STEM/bc20efbc-7479-4042-9798-a99c09bfa65f.png?resizew=212)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392902d611863c6908a48e696e7bd8f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf12905647aeeded72bbca21a63f319.png)
(3)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd3bd9c2db8c9f3cb8c6c7d7cbf5465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b3ef121201d34187b7fa9be55f84b5.png)
您最近一年使用:0次