如图,在四棱锥P-ABCD中,四边形ABCD为菱形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/b4513714-97c1-42a5-99c4-1156fda2ee35.png?resizew=232)
(1)证明:平面PAB⊥平面ABCD;
(2)求二面角P-AD-B的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14f698605a196cf83ccba6a601d0e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37459c5184f2e7400043691277625cc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/b4513714-97c1-42a5-99c4-1156fda2ee35.png?resizew=232)
(1)证明:平面PAB⊥平面ABCD;
(2)求二面角P-AD-B的余弦值.
更新时间:2022-05-28 21:45:01
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【推荐1】如图,在梯形
中,
,
,
,
是
的中点,将
沿
折起,记折起后的三角形为
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/fd1b186c-5135-4b0f-be03-4196eab94c56.png?resizew=375)
(1)证明:平面
平面
;
(2)问在线段
上是否存在点
,使得
,若存在,求出
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef699f5dc072b853cfe700c6f1abbbae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc422f4e3413fe1f5e2fde0410d9c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf3746205daae4787d8e31d74ba79e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965b52d9a4ef9b9c0c8eb8db7fd448cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3f358783eb932610a4466f09aaf1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804e0e03f39917c43ed38442d99b1c52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/fd1b186c-5135-4b0f-be03-4196eab94c56.png?resizew=375)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5089810cdc7a98dcada621845e8bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3142b1af4ce67d3e55417b4c0de257.png)
(2)问在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b833db5aa6e38de0cdd55bcab1c74c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03692651fb8b8c1c501c0042fe731f91.png)
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【推荐2】如图,在四棱锥
中,四边形
是矩形,侧面
底面
,若点
分别是PC,BD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/f5a1c1e3-3899-4a53-8716-5a84789aa95e.png?resizew=250)
(1)求证:
∥平面PAD;
(2)求证:平面PAD⊥平面PCD
![](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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/f5a1c1e3-3899-4a53-8716-5a84789aa95e.png?resizew=250)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)求证:平面PAD⊥平面PCD
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【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.
(1)求证:PC // 平面BDE;
(2)若PC⊥PA,PD=AD,求证:平面BDE⊥平面PAB.
(1)求证:PC // 平面BDE;
(2)若PC⊥PA,PD=AD,求证:平面BDE⊥平面PAB.
![](https://img.xkw.com/dksih/QBM/2018/6/12/1965789809459200/1968470763716608/STEM/c7277f4514ff496784fc821b18439e25.png?resizew=168)
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【推荐1】如图,在五面体ABCDEF中,四边形ADEF是正方形,FA⊥平面ABCD,BC∥AD,CD=1,AD=
,∠BAD=∠CDA=45°.
(Ⅰ)求异面直线CE与AF所成角的余弦值;
(Ⅱ)证明CD⊥平面ABF;
(Ⅲ)求二面角B-EF-A的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
(Ⅰ)求异面直线CE与AF所成角的余弦值;
(Ⅱ)证明CD⊥平面ABF;
(Ⅲ)求二面角B-EF-A的正切值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/0e3aca8b-b0be-445a-84c6-d09b1aee88d7.png?resizew=113)
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【推荐2】如图,在四棱锥
中,底面
满足
平面
,且
.
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872422041985024/2948680346017792/STEM/5e8825be67364788b6fbf7f7629eb568.png?resizew=184)
(1)证明:
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2adb8e53cd26c16216a001eeb84dc7e7.png)
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872422041985024/2948680346017792/STEM/5e8825be67364788b6fbf7f7629eb568.png?resizew=184)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
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