如图,在四棱锥P-ABCD中,底面ABCD为矩形,E是CD的中点,AE与BD交于点F,G是
的重心.
(1)求证:
平面PCD;
(2)若平面PAD⊥平面ABCD,
为等腰直角三角形,且
,求直线AG与平面PBD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/13321342-b4fb-4961-b157-31551c117c0b.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0589b6dcbacda58c88b594a3abe72461.png)
(2)若平面PAD⊥平面ABCD,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4563510839c5f01ae918a979be95a47b.png)
更新时间:2023-05-12 15:39:42
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相似题推荐
解答题-证明题
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适中
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名校
解题方法
【推荐1】如图,在四棱锥
中,已知底面
是菱形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/f1c00338-084e-41f9-9adf-c4efc02cafbb.png?resizew=170)
(1)若
,求证:平面
面
;
(2)设
为
的中点,且
,求证:
平面
,并求平面
与棱
的交点
的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/f1c00338-084e-41f9-9adf-c4efc02cafbb.png?resizew=170)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d0710321d97361e5782124bbf7f0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)设
![](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/f073e958f93d0dac819b0ba20f8fc66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2e849754baf604fa48efe2c82657af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2e849754baf604fa48efe2c82657af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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解答题-证明题
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适中
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【推荐2】在等腰梯形
中,
,
,
,
是
的中点,将梯形
绕
旋转
,得到梯形
(如图).
![](https://img.xkw.com/dksih/QBM/2019/1/16/2120216587345920/2120235625373696/STEM/e049d6772ba14e47a770f39ccc341389.png?resizew=197)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d34ac97b116fc5c4e99d07dda1c50b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d357c65198d5d3cea28ae6efc15522b.png)
![](https://img.xkw.com/dksih/QBM/2019/1/16/2120216587345920/2120235625373696/STEM/e049d6772ba14e47a770f39ccc341389.png?resizew=197)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0858e95286f78ae62a55592d250e53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6482188fb0ec592feb320732b9955f8c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60945d9957bddf3ba5800452b266e063.png)
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解答题-问答题
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适中
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【推荐3】在直三棱柱
中,
,
,N,M分别是BC,
的中点,点P在线段
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/933b58f9-ab1d-47aa-906e-a0394b8f3ffa.png?resizew=152)
(1)若P为
的中点,证明:
平面
;
(2)是否存在点P,使得平面PMN与平面ABC所成的二面角为45°?若存在,试确定点P的位置;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/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09bdbf17f7bb0e70a339b4a1971d5c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/933b58f9-ab1d-47aa-906e-a0394b8f3ffa.png?resizew=152)
(1)若P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdcbfb4d473b0a5a5b07fcdcb9ee3644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)是否存在点P,使得平面PMN与平面ABC所成的二面角为45°?若存在,试确定点P的位置;若不存在,请说明理由.
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解答题-证明题
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适中
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名校
解题方法
【推荐1】如图所示,在直三棱柱ABC﹣A1B1C1中,侧面AA1C1C为长方形,AA1=1,AB=BC=2,∠ABC=120°,AM=CM.
![](https://img.xkw.com/dksih/QBM/2021/11/12/2849537746337792/2851026422489088/STEM/73b2adb5-9c7d-42dd-ae8a-272d1f4cf234.png?resizew=212)
(1)求证:平面
平面
;
(2)求直线A1B和平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2021/11/12/2849537746337792/2851026422489088/STEM/73b2adb5-9c7d-42dd-ae8a-272d1f4cf234.png?resizew=212)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0671b4776e142e17a79af5b3f0378ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9921c943a00c97ef3a429c913538be12.png)
(2)求直线A1B和平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9921c943a00c97ef3a429c913538be12.png)
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解答题-证明题
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适中
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【推荐2】如图,在平行四边形
中,
,
,
为线段
的中线,将
沿直线
翻折成
,使平面
⊥平面
,
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/6938e0dc-9b48-4639-a815-91d0295c8c60.png?resizew=186)
(1)求证:
平面
;
(2)设
为线段
的中点,求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13c772461aef1d9d715129636739748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dbf33492e5223df78dea34a24ae015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c87014fbb5c656a4f1892dbd88f242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/6938e0dc-9b48-4639-a815-91d0295c8c60.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c87014fbb5c656a4f1892dbd88f242.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c87014fbb5c656a4f1892dbd88f242.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,在三棱柱
中,
为正三角形,
,
,
,点
为
的中点,点
.
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461197630693376/2461409968914432/STEM/8a385be8ee65478fbe9f02e5b82d7d7b.png?resizew=203)
(1)证明:
;
(2)求
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98474425eb86a28f2b01cec95643ae7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9d5815dc775d5a5810fff0b016a8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00de3b5f3920068743971c8f05638863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf821ca9421940a4ccf8bd03534b4b9.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461197630693376/2461409968914432/STEM/8a385be8ee65478fbe9f02e5b82d7d7b.png?resizew=203)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d1a365832df6937ff1411728420538.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022129b7ae91e9a6a8badb203d2045a1.png)
您最近一年使用:0次