【2018衡水金卷(三)】如图所示,在三棱锥
中,平面
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/ab5469d8-e4f9-4991-96f7-32fa9f09b7fb.jpg?resizew=181)
(1)证明:
平面
;
(2)若二面角
的平面角的大小为
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cad7b03f934718b18ce34cdf0b85863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991ec04fb924fd2407b679f56645126e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413240c7a387889f4e5ffdb72e271a67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/ab5469d8-e4f9-4991-96f7-32fa9f09b7fb.jpg?resizew=181)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60870baa5e3fbc33a749aa5f0a94be.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2dff5ed9baa18e33592a52f8b9626f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
2018·河北衡水·一模 查看更多[2]
更新时间:2018-02-27 19:42:23
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】在三棱柱中,平面
平面
,侧面
为菱形,
,
,
,E是AC的中点.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e16f65c3a318220c2f5baac171bbb61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
(2)确定在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914d46f7e72b55d2ff3d9bc38e02b31d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9e9bb0d4d5497cb54ed60d86116129.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在四边形
中,
,
,
,以
为折痕把
折起,使点
到达点
的位置,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/f60f964b-4c84-45e7-9fd9-3074f9299798.png?resizew=168)
(1)证明:
平面
;
(2)若
为
的中点,
,三棱锥
的表面积为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307d38cc7012c328f1f22aa793fe76d7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/f60f964b-4c84-45e7-9fd9-3074f9299798.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd0feb3d579d3ce5ac7d11e97176431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1941565407f373b0990da4a6438e99c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9d0e698b54e331467bf6c2842ea2ac.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,
.
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981204673331200/2981246892359680/STEM/72194227-ceb9-4207-a427-05614b70cca0.png?resizew=214)
(1)若
,证明:平面
平面
;
(2)若
,求直线
与平面
所成角的正切值的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62cbbf12ed2e8c26298afd6265327ed2.png)
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981204673331200/2981246892359680/STEM/72194227-ceb9-4207-a427-05614b70cca0.png?resizew=214)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf6c62979a7aa534a191d8387a741e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b6c6c3bc89020d2fcb885cb99f7435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知四边形ABCD是菱形,
,
绕着BD顺时针旋转
得到
,E是PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/02644d21-2be4-404f-a54f-c470e8bffe9a.jpg?resizew=194)
(1)求证:
平面BDE;
(2)求直线AP与平面PBC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/02644d21-2be4-404f-a54f-c470e8bffe9a.jpg?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1666b45ed176d648dd1764f4a2dbd73.png)
(2)求直线AP与平面PBC所成角的正弦值.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在直三棱柱
中,AC⊥BC,E为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/309c6e47-6df8-4859-9af6-0c0bbd64b78d.png?resizew=158)
(1)证明:
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d261edf9b4cfa7232e2bc184db1995.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/309c6e47-6df8-4859-9af6-0c0bbd64b78d.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993830e5de2bbf858071d375bbf186f8.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在直三棱柱
中,
,
是棱
的中点,
为线段
与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/1296b744-c1d9-462e-8b95-a0087f327566.png?resizew=163)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
平面
;
(2)求证:
.
![](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/46d387c5e3c0a9d9c096e84907b21407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/1296b744-c1d9-462e-8b95-a0087f327566.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e862713d078c4f06ec1f15ccd6f5a1f7.png)
您最近一年使用:0次
【推荐1】如图,在四棱锥
中,
,底面ABCD为矩形,
,
,
,
.
(1)证明:平面
平面ABCD;
(2)求四棱锥
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8337d3e8670a9ed0165ac853b80af3d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49437f474e5805688dff21ded2d1fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9f8cc067ffd09137ffb7942175f0970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d6170383f24a8a0ec5e8d6cb80ac332.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/6db080b4-c22a-47e6-96db-94a2aa00f126.png?resizew=119)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877582b5387278008d14fe5932622fe7.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知在四棱锥
中,侧面
底面
,且侧面
是等边三角形,底面
是正方形,
分别是
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882960865665024/2883214394384384/STEM/858ac3dfc28a4c89b184db57f1162edd.png?resizew=298)
(1)证明:平面
平面
;
(2)求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e58e5a299e7b6b508c61244b93ae1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c128abb6a3291db0b33c27a2a8d997dd.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882960865665024/2883214394384384/STEM/858ac3dfc28a4c89b184db57f1162edd.png?resizew=298)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a68a008a22d5a8cea5fe8dcf31e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次