如图所示,在四棱锥
中,底面
是边长为
的正方形,
分别为
的中点,侧面
底面
且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2cbc5e89a324214f70a8c00ef1a264b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758499364667392/2779454902763520/STEM/48d7c6ad14d84c2896a9ded0336b8d38.png?resizew=197)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ae9e915d670edaa52d9ad9f3f071a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c707f0202ec1aa233e1eeacc7a4587d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2cbc5e89a324214f70a8c00ef1a264b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758499364667392/2779454902763520/STEM/48d7c6ad14d84c2896a9ded0336b8d38.png?resizew=197)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b183492677d0457b8701c53d9fa1414.png)
更新时间:2021-08-05 08:38:23
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相似题推荐
解答题-问答题
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【推荐1】如图,三棱锥P-ABC中,平面PAC
平面ABC,
ABC=
,点D、E在线段AC上,且AD=DE=EC=2,PD=PC=4,点F在线段AB上,且EF//BC.
(Ⅰ)证明:AB
平面PFE.
(Ⅱ)若四棱锥P-DFBC的体积为7,求线段BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
(Ⅰ)证明:AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(Ⅱ)若四棱锥P-DFBC的体积为7,求线段BC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/2da27b6a-3feb-4814-9214-5e367c92eeb6.png?resizew=173)
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【推荐2】如图,在边长为
的菱形
中,
,点
分别是边
,
的中点,
,沿
将
翻折到
,连接
,得到如图的五棱锥
,且
.
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/595dd52221884d0b978ca4c00c0d54db.png)
(1)求证:
;
(2)求四棱锥
的体积.
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/3b027be586de45979cdc327a7e4d99c8.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/0082016e1eb7401b98d4bab11a50894a.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/1e6b14bb0f6e4185a53b68cb96a8acb6.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/c3feb915868140e18a95352b80c2fdb2.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/c2f12933a828478689536ab040b9a712.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/222f59756e7044e5a50a421a5aefe4bc.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/bda19a455edd4091b3d93f113bc0868d.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/eae90e06f38b405785b05ae0d3a9c30b.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/12103783eaa146129942225d01a567f0.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/64f3a1c25e734f66b7c7a15cc6aa3130.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/980b9f8fd83249a4b53cc239304b79ae.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/8d8f7aaadbc24e4ca33d848cdc320379.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/e86654905e6741bea247cb00f15d749d.png)
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/595dd52221884d0b978ca4c00c0d54db.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/c4ee5b9076a14a2b9ca294087a12cc8a.png)
(2)求四棱锥
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572594296356864/1572594302189568/STEM/cdb7f492930a407d97905c914085dc1b.png)
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解题方法
【推荐1】如图,在直三棱柱
中,
,
为棱
的中点,
.
![](https://img.xkw.com/dksih/QBM/2019/6/1/2216051115065344/2218635148353536/STEM/fffdabd46067489c892f2d18600bfbf9.png?resizew=177)
(1)证明:
平面
;
(2)设二面角
的正切值为
,
,
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5adb94abf5e78c3bf7d9bced713017a.png)
![](https://img.xkw.com/dksih/QBM/2019/6/1/2216051115065344/2218635148353536/STEM/fffdabd46067489c892f2d18600bfbf9.png?resizew=177)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d13793af05742c91532f43727eb9780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)设二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c079889aea502b5783046f78728eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4175fa7504dc7d84fbeacfdaf1336fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db1d48817b63eba957ac50fe259af0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】如图,四棱锥P﹣ABCD中,底面ABCD为梯形,AB∥DC,∠BAD=90°,点E为PB的中点,且CD=2AD=2AB=4,点F在CD上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/25c66b62-d8a5-43ec-a276-379a78770173.png?resizew=171)
(Ⅰ)求证:EF∥平面PAD;
(Ⅱ)若平面PAD⊥平面ABCD,PA=PD且PA⊥PD,求直线PA与平面PBF所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a986e6cfd114c3c7978be62259e7c19d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/25c66b62-d8a5-43ec-a276-379a78770173.png?resizew=171)
(Ⅰ)求证:EF∥平面PAD;
(Ⅱ)若平面PAD⊥平面ABCD,PA=PD且PA⊥PD,求直线PA与平面PBF所成角的正弦值.
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【推荐3】如图,在多面体
中,平面
平面
平面
和
均为正三角形,
,点
为棱
上一点.
(1)求证:
平面
;
(2)若
为
中点,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7cb46a04cfc59830066f75e2a70e9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3cfd6b6a7e911d10d1a4bed9ca5e749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea2687aecc2ccdfc6da48d93b125ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/41926caf-44cf-4e02-a4b7-97ae326ea616.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176385d91d5e29324fce4a932eff6a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
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解题方法
【推荐1】如图,在三棱锥A-BCD中,平面ABD⊥平面BCD,AB=AD,O为BD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/6180c37f-51cf-455e-9323-2003ae2958b0.png?resizew=160)
(1)证明OA⊥平面BCD;
(2)若△OCD是边长为1的等边三角形,点E在棱AD上,DE=2EA,且二面角E-BC-D的大小为45°,求点B到平面EOC的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/6180c37f-51cf-455e-9323-2003ae2958b0.png?resizew=160)
(1)证明OA⊥平面BCD;
(2)若△OCD是边长为1的等边三角形,点E在棱AD上,DE=2EA,且二面角E-BC-D的大小为45°,求点B到平面EOC的距离.
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【推荐2】如图,四面体
中,
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/b86e252e-ecfc-4bdf-b83b-d589ff8f3ac2.png?resizew=151)
(1)求
的面积;
(2)求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd654221ab95fe241d9e0202443f2609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1f0690d47cac82c8d27e10c8444d57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddaa9bfa78f9405cdcc11a1703233715.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/b86e252e-ecfc-4bdf-b83b-d589ff8f3ac2.png?resizew=151)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
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【推荐3】如图,已知菱形
中,
,直角梯形
中,
,
,
,
分别为
中点,平面
平面
.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896297974628352/2899174074638336/STEM/257929dcb40d4118a25ba7f82033be74.png?resizew=219)
(1)求证:
平面
;
(2)异面直线
与
所成角的大小;
(3)线段
上是否存在一点
,使得直线
与平面
所成角的正弦值为
,若存在,求出
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b5d8835312ea8b07c0f6c7740fbef65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea04814d8e706040feac271b50b66c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eed15d0ed75bf936f224f931da5d950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac107155d65701fbbcd6b6740b510e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e650f493b12fda60ddb12fc32a3388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e89423a12948f0fa4f9fe7adf956a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c674dc5024374f53920947c4cf4baf11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896297974628352/2899174074638336/STEM/257929dcb40d4118a25ba7f82033be74.png?resizew=219)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeebdf3d00c146a1b4d220909d7573c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
(2)异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f1918a4291dc32884eb3a9dbab1529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
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