如图所示,四边形
为菱形,
,二面角
为直二面角,点
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941873748787200/2942942385971200/STEM/37e170cf-61d8-46e9-8943-fc844299650c.png?resizew=178)
(1)求证:
;
(2)若
,当二面角
的正切值为
时,求直线
与平面
所成的角.
![](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/d399d731913a563e291b817831a0c678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941873748787200/2942942385971200/STEM/37e170cf-61d8-46e9-8943-fc844299650c.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
更新时间:2022-03-24 08:14:31
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解答题-证明题
|
适中
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【推荐1】在圆锥PO中,高
,母线
,B为底面圆O上异于A的任意一点.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958094116044800/2959245912768512/STEM/910e6a9c-8820-46c4-b2b2-9fcbf48d850f.png?resizew=389)
(1)当
时,过底面圆心O作
所在平面的垂线,垂足为H,求证:
;
(2)当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae890f9e8b32aa53a54158f24f4a87bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2958094116044800/2959245912768512/STEM/910e6a9c-8820-46c4-b2b2-9fcbf48d850f.png?resizew=389)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25490c72ad1b9968e6be5c5f6b268ab3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d162c29b1e484cfc87350dd68f00b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb92d6ab1b9a520e272f3649f35ab07a.png)
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解题方法
【推荐2】已知平面
平面
,平面
平面
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17d06e96403d6ed1ab35f6af95b86b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/675f1e09eb033dab8ef96d1f1c349150.png)
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【推荐1】如图,在四棱锥
中,底面ABCD是边长为2的正方形,△PAB为正三角形,且侧面PAB⊥底面ABCD,M为PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/be9b5ca0-6d2f-4f71-9571-d322bae0606b.png?resizew=217)
(1)求证:PB
平面ACM;
(2)求直线BM与平面PAD所成角的正弦值;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/be9b5ca0-6d2f-4f71-9571-d322bae0606b.png?resizew=217)
(1)求证:PB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)求直线BM与平面PAD所成角的正弦值;
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02535e1a690ca111ca7a395a1bf48080.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面
是边长为2的正方形,
为正三角形,且侧面
底面
,
为
的中点.
(1)求直线
与平面
所成角的大小;
(2)求平面
与平面
夹角的余弦值.
![](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/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/565f6706-b3d6-4df6-9638-e484ea091868.png?resizew=192)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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【推荐1】如图,在直三棱柱
中,
,E为
的中点,平面
平面
.
;
(2)若
的面积为
,试判断在线段
上是否存在点D,使得二面角
的大小为
.若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dee56b9f36ba8f76fe67b76383636b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e827641feb4179bca7033ed8760bf728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0211da37e92f915e781691296578ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f633632c5bb6c44a504c1bd5984ff5e2.png)
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【推荐2】如图,在三棱柱
中,底面
为直角三角形,
,顶点
在底面
内的射影是点B,且
,点T是平面
内一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/480477ae-3d85-4377-bcf4-d0526b9e5ca2.png?resizew=170)
(1)若T是
的重心,求直线
与平面
所成的角;
(2)是否存在点T,使
且平面
平面
?若存在,求出线段
的长度;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac4fb99967c46a3855bcf2885b448c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8b326c931b09e57582161d4a2f28df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2471f7379bd78645475007e2e9e95c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d63354d35b9eef8732c993abe89f25e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/480477ae-3d85-4377-bcf4-d0526b9e5ca2.png?resizew=170)
(1)若T是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5f9ef971747d2d5bbc5823797a7a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fb7dc1bc2fb40e7d68d5294021dbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d63354d35b9eef8732c993abe89f25e.png)
(2)是否存在点T,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcd0e222acaaf75c84d5a215fd3bda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0503b6afee0a65a12b46b7c75cdfc03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c670996eae80113297392487366aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c59ab3c430815c8e1a5cef009876e6e.png)
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【推荐3】如图,在四边形ABCD中,BC=CD,BC⊥CD,AD⊥BD,以BD为折痕把△ABD折起,使点A到达点P的位置,且PC⊥BC.
![](https://img.xkw.com/dksih/QBM/2022/5/15/2980094247780352/2981218525560832/STEM/b80eff73-f0a1-4de6-90da-6b8a30fa596c.png?resizew=182)
(1)证明:PD⊥平面BCD;
(2)若M为PB的中点,二面角P﹣BC﹣D等于60°,求直线PC与平面MCD所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2022/5/15/2980094247780352/2981218525560832/STEM/b80eff73-f0a1-4de6-90da-6b8a30fa596c.png?resizew=182)
(1)证明:PD⊥平面BCD;
(2)若M为PB的中点,二面角P﹣BC﹣D等于60°,求直线PC与平面MCD所成角的正弦值.
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