如图,已知四棱锥
的底面
为菱形,且
,
,
![](https://img.xkw.com/dksih/QBM/2016/9/26/1573039851503616/1573039858106368/STEM/73d29b798456473f939a3be7ae523969.png)
(1)求证:平面
平面
;
(2)设
是
上的动点,求
与平面
所成最大角的正切值;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/830bcf6e86a7705279653c96e5c74a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192bd3b61c1e9e9bde41cdc349f48044.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1573039851503616/1573039858106368/STEM/73d29b798456473f939a3be7ae523969.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2016/9/26/1573039851503616/1573039858106368/STEM/1c3aaa0adc384472a5bf17eeeccaace1.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1573039851503616/1573039858106368/STEM/cb153c72d70c4076b9956455d5469821.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1573039851503616/1573039858106368/STEM/991520ba0b224a459f329bb0c88a89a4.png)
![](https://img.xkw.com/dksih/QBM/2016/9/26/1573039851503616/1573039858106368/STEM/2b89f1b188764da597f28a7870ab67a4.png)
(3)求二面角
![](https://img.xkw.com/dksih/QBM/2016/9/26/1573039851503616/1573039858106368/STEM/6a8a8a3fee1f407e81a816a8f180c91a.png)
更新时间:2016-12-04 21:00:41
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名校
解题方法
【推荐1】如图,在四棱锥P-ABCD中,PA⊥面ABCD,AB=4,BC=3,AD=5,PA=4,∠DAB=∠ABC=90°,E是CD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/fbe390ad-ef19-4ad3-b6ea-eceda2cf9a52.png?resizew=167)
(1)求异面直线BC与PD所成角的正切值;
(2)求证:CD⊥PE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/fbe390ad-ef19-4ad3-b6ea-eceda2cf9a52.png?resizew=167)
(1)求异面直线BC与PD所成角的正切值;
(2)求证:CD⊥PE.
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【推荐2】如图,在长方体
中,底面
是边长为2的正方形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/dedeb3b6-922f-428d-b690-d450b8f78ce5.png?resizew=166)
(1)求证:
平面
;
(2)求异面直线
与
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/295aced98768ce261e00fe6660a427a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/dedeb3b6-922f-428d-b690-d450b8f78ce5.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504a36c231b8e80724d01649e7c0944f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐1】如图,四棱锥
的底面为正方形,
是四棱锥的高,
与平面
所成角为
,
是
的中点,
是
上的动点.
(1)证明:
;
(2)若
是
上的中点,求
与平面
的所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/300ba732-83ad-4f6f-91f2-c153e04f5f5b.png?resizew=141)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a395778dcf588264f40e1cd8c96206d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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【推荐2】在如图所示的几何体中,四边形
是边长为3的菱形,
,
⊥平面
,
与平面
所成角为
.
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572571991564288/1572571997995008/STEM/3c8764c5914c4b74865b91781ddd830a.png)
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e77ea3c01a4f8db68aef920dbee9a64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ddd5d3a73b6b5a6a286d26519b34c25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d539cc46b0195b1d9963a7305bcd94.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572571991564288/1572571997995008/STEM/3c8764c5914c4b74865b91781ddd830a.png)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572571991564288/1572571997995008/STEM/b93fe98e0c804edb9ba89d8809d596f8.png)
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572571991564288/1572571997995008/STEM/fc0ffa8b0c354d31a2e7b3ffb247b496.png)
(Ⅱ)求二面角
![](https://img.xkw.com/dksih/QBM/2016/4/7/1572571991564288/1572571997995008/STEM/6b7b150c5f4e476994c2773933cc8fc2.png)
您最近一年使用:0次