如图,在四棱柱
中,底面
是平行四边形,
,侧面
是矩形,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/2c272405-1092-4966-82e6-fb6c5954e7b3.png?resizew=184)
(1)证明:
平面
;
(2)求三棱锥
的体积.
![](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/fbeb1554fc1cec56b983a08e9dc52c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db49db1eb44aec714e614d5c6a01406b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a0fe0d6a3d54021cba09766acbd8b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/2c272405-1092-4966-82e6-fb6c5954e7b3.png?resizew=184)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07391ef575d28f09bc5cda0ff8130a54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041434f0c90fb3cdd685b8eb1c2b4b26.png)
2022·山西吕梁·三模 查看更多[3]
更新时间:2022-05-21 22:23:24
|
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解答题-问答题
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较难
(0.4)
名校
解题方法
【推荐1】如图,长方体
中,
,
,点
是棱
的中点.
与
所成的角的大小;
(2)是否存在实数
,使得直线
与平面
垂直?并说明理由;
(3)若
.设
是线段
上的一点(不含端点),满足
,求
的值,使得三棱锥
与三棱锥
的体积相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d64fc81c857b124268609a8beb77b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a1c6340bb12cc1bbcda66ac6745fdc3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243f56cd7aee580cfac46381a9104541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702352870635edf16f84f89a7a2b16a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f7a5a786edea0ed1a153701ced50fd.png)
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解答题-证明题
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【推荐2】如图所示,菱形
与正三角形
所在平面互相垂直,
平面
,且
,
.
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/784dba279afd4994a843c1040d9c9f62.png)
(1)求证:
平面
;
(2)若
,求几何体
的体积.
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/c0d4bdd3aa2b4d8aaaa2b50a0222b095.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/27bd0740ad554fcb8e8a0d78519d4740.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/946436efa1a44130800fe9558dfe8bf3.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/c0d4bdd3aa2b4d8aaaa2b50a0222b095.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/cb395340505d4e35b7e30cb03ebb96e8.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/97333b2930734c2594ace8d7b9bdb68c.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/784dba279afd4994a843c1040d9c9f62.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/05c86addbe614e6696840184485476be.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/c0d4bdd3aa2b4d8aaaa2b50a0222b095.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/c0b99224f36f476d864f667f2a28b4a4.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572858639147008/1572858644733952/STEM/54d3b8942221410b955db4a3ba4e15ea.png)
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【推荐1】如图,在四棱锥P﹣ABCD中,底面ABCD是菱形,∠BAD=60°,边长为4的正△PAD所在平面与平面ABCD垂直,点E是AD的中点,点Q是侧棱PC的中点.
(2)求证:PA∥平面BDQ;
(3)在线段AB上是否存在点F,使直线PF与平面PAD所成的角为30°?若存在,求出AF的长,若不存在,请说明理由?
(2)求证:PA∥平面BDQ;
(3)在线段AB上是否存在点F,使直线PF与平面PAD所成的角为30°?若存在,求出AF的长,若不存在,请说明理由?
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【推荐2】如图,在四棱锥
中,
平面ABCD,底面ABCD为梯形,
,
,
,
,E为PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/96fa19ec-04ce-4e8b-bab6-0a3b2420600b.png?resizew=189)
证明:
平面PAD;
求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77dca0e33db66ed5fcb6e5f797b99f8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5408641691fd27f6dd8cf0ab2043ad4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ee724487bee24502778d957546c946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a94fec95809f5e61feaf9c1e0f140c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee82a25c3ccc4bd94f3f528ff3e95713.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/96fa19ec-04ce-4e8b-bab6-0a3b2420600b.png?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5258a6f9c63914b9e2ec95b6d39313b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8282f7fe4c82900a207e7267bf43b300.png)
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