如图,已知点是平行四边形
所在平面外的一点,
,
分别是
,
的中点,求证:
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/c0d58317-a32e-4fe2-bd59-1a49d1ec32e3.png?resizew=173)
23-24高二上·上海宝山·阶段练习 查看更多[2]
上海市宝山区海滨中学2023-2024学年高二上学期10月学业质量检测数学试题(已下线)第一章 点线面位置关系 专题一 空间平行关系的判定与证明 微点4 直线与平面平行的判定与证明综合训练【基础版】
更新时间:2023-10-15 14:31:54
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【知识点】 证明线面平行
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解答题-证明题
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解题方法
【推荐1】如图:在正方体
中
,
为
的中点.
的体积;
(2)求证:
平面
;
(3)若
为
的中点,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d90f940f5693b22ddf2e7c761887d8.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11f1840eb8b17e7b07c3fe7e987a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920f9a182ba419efef8fb4a791c60fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef06a52945f8a26a4df410a777d79b7.png)
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解答题-证明题
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【推荐2】如图,直三棱柱
的体积为
,
,
与
交于点D,E为BC中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/68858b19-25f4-4376-8756-1dedc1ea5589.png?resizew=124)
(1)求证:
//平面
;
(2)若
,
,求直线
与平面DEC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.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/2022/11/20/68858b19-25f4-4376-8756-1dedc1ea5589.png?resizew=124)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ab65ee37f026c0adc5009bafca69f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
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