如图所示,
是正方形,
是正方形的中心,
底面
,底面边长为
,
是
的中点
![](https://img.xkw.com/dksih/QBM/2020/12/21/2618814638792704/2627343571697664/STEM/da17f698dc62484386772ef812a8304f.png?resizew=211)
(1)求证:
平面
;平面
平面
;
(2)若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2020/12/21/2618814638792704/2627343571697664/STEM/da17f698dc62484386772ef812a8304f.png?resizew=211)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63cfa6bd79a7ab2ae654d5131ce6db34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
更新时间:2021-01-02 10:47:05
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,已知四棱锥
的底面ABCD是边长为2的正方形,
,E, F分别是AB,CD的中点.
(1)求证:平面
平面
;
(2)当四棱锥
是正四棱锥时,求此时二面角
的余弦值;
(3)当四棱锥
的体积有最大值时,求直线
与平面PCD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a8d346469e1777c10b4f972c3e51f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/22/5af6f8fa-6640-420d-a4d1-ace1d1e6db7e.png?resizew=181)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
(2)当四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
(3)当四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.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,三棱柱
的底面ABC是等边三角形,侧面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/553b403c-41d4-420b-a9f5-c3c67ffcfc68.png?resizew=136)
Ⅰ
求证:
;
(Ⅱ)M,N分别是棱
,
上一点,若
,
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab4629fbb62d88ec595376f3380e543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c37bd421643a9da2f1f010872a2f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c330ca78f6cc4c6b2abe06fbc4e8c1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/553b403c-41d4-420b-a9f5-c3c67ffcfc68.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c34db2029f5e22800720beb432d6da.png)
(Ⅱ)M,N分别是棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42589ec2263c315922a8260891a9766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3aad224c7a39f0ca496a62d57337d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc81bbca4ec7289484963fad4fbd44b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14bfba969045954318feeceb6480591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d5b380117db6e8bb26745f29c7f5882.png)
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解答题-证明题
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解题方法
【推荐3】如图,在四棱锥
中,底面
为菱形,平面
平面
,
,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/9e17c6b2-2a02-4955-874c-0620948b4b5a.png?resizew=194)
(1)求证:直线
平面
;
(2)若
平面
,求证:
;
(3)是否存在点
,使得四面体
的体积等于四面体
的
?若存在,求出
的值;若不存在,请说明理由.
![](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/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1b4b5594177f8a42d6d1ed92427a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/9e17c6b2-2a02-4955-874c-0620948b4b5a.png?resizew=194)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b70cef0b79ca64acbb67dc667fc53b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd72a32b01cde3803f106f00a83458c.png)
(3)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ee3afb7e2c8943673449a1b136faf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9a37505a6b72abc194ad202d52478e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7035d954e76a15924de818e7e10e924a.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐1】如图,在三棱锥
中,
平面
,
,
,
为
的中点,E为
中点,求证:
![](https://img.xkw.com/dksih/QBM/2020/8/8/2523556463763456/2524881597087744/STEM/c15bf2767d06477fb4816b10275cde56.png?resizew=200)
(1)
;
(2)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a41ada2c69a8c4ff1c0a9c780d2a08d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/8/8/2523556463763456/2524881597087744/STEM/c15bf2767d06477fb4816b10275cde56.png?resizew=200)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bc5d8308a060d6068cfc9f69fe79e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128c69eb81dae89c6989d06d20925ad2.png)
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解答题-问答题
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(0.65)
名校
解题方法
【推荐2】如图,在四棱锥
中,
,
,
,
为边
的中点,异面直线
与
所成的角为
.
![](https://img.xkw.com/dksih/QBM/2021/9/18/2810593511522304/2815984778870784/STEM/0b0c9b1b-1633-4043-bc3f-8b753f9cb5ca.png?resizew=266)
(1)在直线
上找一点
,使得直线
平面
,并求
的值;
(2)若直线
到平面
的距离为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6378fc7805bd0729f6a00a8bd2662d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3384e2b63e4be03a8762b819499e669b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://img.xkw.com/dksih/QBM/2021/9/18/2810593511522304/2815984778870784/STEM/0b0c9b1b-1633-4043-bc3f-8b753f9cb5ca.png?resizew=266)
(1)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0684e0b09b04661c602437982c0397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f32f82942e12701f6ba4b87d02291b1.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/452c39e9c252d158710c86a3263c9fe7.png)
您最近一年使用:0次
解答题-问答题
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(0.65)
解题方法
【推荐1】如图,直三棱柱
的底面是边长为
的正三角形,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/21ec073f-d33b-409b-bb8f-4b41a8214828.png?resizew=183)
(1)证明:平面
平面
;
(2)若三棱锥
的体积为
,求直线
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe77efdf5139327dd75c6ca3c022e36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334bd1a151c0a42ca813cb6b839ce45c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/21ec073f-d33b-409b-bb8f-4b41a8214828.png?resizew=183)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062e008fb2224a797b360a10e0c4e688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250b5107cbd77faecb232faa478adfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b7b7793d29d66dfdd89e7a6564a35c.png)
您最近一年使用:0次
解答题-证明题
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(0.65)
解题方法
【推荐2】如图,在四棱锥
中,底面
为正方形,
平面
,
,
为
的中点,
为棱
上一动点.
(1)
在棱
上何处时,可使得
平面
?并证明你的结论;
(2)求证:平面
平面
.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfbaf73297240eb116f22489519895a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/58b45cc1-be6e-47ed-82d2-fd6e4b978dab.png?resizew=155)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次