名校
解题方法
1 . 在正方体
中,M,N分别是线段
,BD的中点.
(1)求证:
平面
;
(2)若正方体的棱长为2,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/d90da177-0239-4746-aaba-131905a644fc.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)若正方体的棱长为2,求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/849c81e59c9f79f27315e31a04fd401f.png)
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2023-06-16更新
|
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4卷引用:内蒙古自治区通辽市科尔沁左翼中旗实验高级中学2022-2023学年高一下学期第二次月考数学试题
解题方法
2 . 如图,在四棱锥
中,平面
底面
,底面
为正方形,
,
为
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/7315c661-7931-41b4-977d-c3f584c9c4de.png?resizew=162)
(1)证明:
∥底面
;
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52c3fc5a6cfba032ff7480e3c917376.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/7315c661-7931-41b4-977d-c3f584c9c4de.png?resizew=162)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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2023-04-24更新
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3卷引用:内蒙古自治区通辽市科尔沁左翼中旗实验高级中学2022-2023学年高一下学期期中数学试题
3 . 如图,在四棱维
中,底面
是边长为2的正方形,
为正三角形,且侧面
底面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8274d650-d4c3-451a-ba07-7b38b437b1f6.png?resizew=250)
(1)求证:
平面
;
(2)求二面角
的余弦值
![](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/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74837b473f275b811eae37cfd3f4bdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8274d650-d4c3-451a-ba07-7b38b437b1f6.png?resizew=250)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68a7bf0da4f7c6f739d2e2461ad9b7.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a8e0c5bcf2d86726cd9f561b8ff5fe.png)
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2021-03-25更新
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3卷引用:内蒙古自治区通辽新城第一中学2021届高三第三次增分训练数学(理)试题
名校
解题方法
4 . 如图,直三棱柱
中,
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2020/8/26/2536414180196352/2542593519288320/STEM/60eb72f624334c2081632303ea8e806e.png?resizew=170)
(1)证明:
平面
;
(2)若
,
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/2020/8/26/2536414180196352/2542593519288320/STEM/60eb72f624334c2081632303ea8e806e.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810ee7bc82b6f452afb3fc18691abc3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba99277e38f8d9f817a9d7db8198219.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ace5a8ec43ae59f0a445450470469fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602f528560c2651ed07132017519e0c5.png)
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2020-09-04更新
|
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3卷引用:内蒙古奈曼旗第一中学2020-2021学年高二上学期期中数学(文)试题
5 . 已知E、F、G、H为空间四边形ABCD的边AB、BC、CD、DA上的点, 且EH∥FG.求证:EH∥BD.
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792262417530880/1793795300515840/STEM/ce30eccba97c4c3a98ed897277e01423.png?resizew=129)
您最近一年使用:0次
2016-12-02更新
|
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9卷引用:2012-2013学年内蒙古通辽甘旗卡二中高一下学期期中考试文科数学卷
(已下线)2012-2013学年内蒙古通辽甘旗卡二中高一下学期期中考试文科数学卷(已下线)2012-2013学年重庆市万州二中高二上学期10月月考考理科数学试卷山西省运城市康杰中学2017-2018学年高二上学期第一次月考数学(文)试题山西省运城市康杰中学2017-2018学年高二上学期第一次月考数学(理)试题北京师范大学附中2018-2019学年高一(国际班)下学期期末考试数学试题宁夏银川市育才中学勤行校区2019-2020学年高一上学期第二次月考数学试题广东省佛山市顺德区第一中学2019-2020学年高二上学期期中数学试题人教A版高中数学必修二2.2.2平面与平面平行的判定2(已下线)8.5.2 第2课时 直线与平面平行的性质(课时作业)-2021-2022学年高一数学同步精品课件+课时作业(人教A版2019必修第二册)