如图,矩形
所在的平面垂直于平面
,
为
的中点,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/64077d4a-1171-413b-9a38-912f0f845983.png?resizew=132)
(1)求异面直线
与
所成角的余弦值;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4a6b8ef3e79b4482388c3391d8b18.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/d3b0cef0afd8048632c095429dfa0082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7c8630dc73828eec20b778072909fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/64077d4a-1171-413b-9a38-912f0f845983.png?resizew=132)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e231505648333857565accb0c3c898.png)
20-21高三上·江苏无锡·期末 查看更多[2]
更新时间:2020-03-04 21:37:48
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解答题-证明题
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【推荐1】如图,在四面体
中,底面ABC是边长为1的正三角形,
,点P在底面ABC上的射影为H,
,二面角
的正切值为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/b163ccc3-5d33-4632-973d-143b3937f0da.png?resizew=146)
(1)求证:
;
(2)求异面直线PC与AB所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d975f472e1663622e2b7629a3f5ff95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97145e11dfb0e127164187f11288e6b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f7a0ab16cbb95691b3d80334a91401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/b163ccc3-5d33-4632-973d-143b3937f0da.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
(2)求异面直线PC与AB所成角的余弦值.
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解题方法
【推荐2】在长方体
中,
,M为
中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d9eff465-6850-4ded-83f6-0acf9d167e7d.png?resizew=178)
(1)求异面直线
与
所成角的余弦值;
(2)
分别为直线
上的点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5481483f111e503a0c92dc3b4fa4f634.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88517eaaa7c6f423f565f938404105a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d9eff465-6850-4ded-83f6-0acf9d167e7d.png?resizew=178)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201876f4b5bd90a718443fc662c13b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82358b724051b032c7ec734a226ae84.png)
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解答题-问答题
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适中
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解题方法
【推荐1】如图,在三棱柱
中,
侧面
,已知
,
,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/c1d0a41b-a3e0-4f10-98f3-9b22e5d52a1b.png?resizew=149)
(1)求二面角
的正弦值;
(2)在棱
上是否存在一点
,使得
与平面
所成角的正弦值为
?若存在,求
;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6acca15566e1a92a013ba736429318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d080ff91f43e7cb68120178e77a5980f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/c1d0a41b-a3e0-4f10-98f3-9b22e5d52a1b.png?resizew=149)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80445f463fa0bdc97c0ba062d03ce342.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea86090c412d8ab5f1e5f974329319ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f97beed73a093138b672b092c924a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】如图,在四棱锥
中,底面ABCD是矩形,
平面
,
,E是PD的中点.
![](https://img.xkw.com/dksih/QBM/2022/1/31/2906173291855872/2917181755064320/STEM/2db406f7-11c7-4eb2-b8a2-907d54030cfe.png?resizew=162)
(1)求证:
平面
;
(2)若平面AEC与平面PEC所成角的余弦值为
,求PA的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4564baf209de77802d46cda82995c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58da37b3d1dbd2fee75089d5ba28134.png)
![](https://img.xkw.com/dksih/QBM/2022/1/31/2906173291855872/2917181755064320/STEM/2db406f7-11c7-4eb2-b8a2-907d54030cfe.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0651af49ab42b58098873b46975650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02be2e28cef91610fc5e92ab1a2ad075.png)
(2)若平面AEC与平面PEC所成角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
您最近一年使用:0次