在正方体
中,
为
的中点,
为棱
上一点,平面
交棱
于点
,交棱
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/82065d21-1cd4-4f60-9aa7-499d95ec1552.png?resizew=146)
(1)若
,求
;
(2)若
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2906d4142e9715cdac924510d8c44f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/82065d21-1cd4-4f60-9aa7-499d95ec1552.png?resizew=146)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5cd31e96c7b52a18074993829b18c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ddb339df743a4f0347823beee5516b6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f500345f1879c259ce50539272d85e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4250bb6bc8aa91b3f84538f2c7581fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
22-23高二上·河南·阶段练习 查看更多[3]
河南省部分名校2022-2023学年高二上学期9月联考数学试题(北师大版)(已下线)8.5.2直线与平面平行(精练)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)山西省朔州市怀仁市第九中学高中部2023-2024学年高二上学期期中数学试题
更新时间:2022-09-30 11:03:25
|
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解答题-问答题
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适中
(0.65)
【推荐1】如图,已知四棱锥
的底面是平行四边形,
底面
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2018/4/27/1933054835236864/1936049827020800/STEM/6a747b98917b4f75932360d47d295ca7.png?resizew=185)
(1)证明:直线
平面
;
(2)设二面角
为30°,且
,
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19935e386ac54c8257a4b9ea0bd9d7a6.png)
![](https://img.xkw.com/dksih/QBM/2018/4/27/1933054835236864/1936049827020800/STEM/6a747b98917b4f75932360d47d295ca7.png?resizew=185)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025fef3406df56489964739acf8ad3df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)设二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90cc9213d7637db3529731325bc4e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bee98f42db414bbd4372a8023b4969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,四边形ABCD是菱形,
平面ABCD,
,
平面BDE,G是AB中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/de0d8c85-98d8-4804-a3a3-def988906464.png?resizew=162)
求证:
平面BCF;
若
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3b5036e913b95245859278b68d3cf9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c943379a9eaf10e15601b0d95d57d65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48d69b63883e9383060666cad2a0c71.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/de0d8c85-98d8-4804-a3a3-def988906464.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在空间四边形
中,
分别是
的中点,
分别是
上的点,满足
.
四点共面;
(2)设
与
交于点
,求证:
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59291aa62eb8c7f2103fc17f19c35259.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】正方形
的边长为2,
,
分别为边
,
的中点,
为线段
的中点,如图将正方形沿
折起,设
(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/b6d2863e-b07d-40af-87f0-df9856f3461b.png?resizew=191)
(1)直线
与由
,
,
三点所确定平面的交点为
,试确定点
的位置,并证明直线
平面
;
(2)若二面角
的余弦值的绝对值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/b6d2863e-b07d-40af-87f0-df9856f3461b.png?resizew=191)
(1)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e8fce8b2c9d2d3b7fbc0ad0a617bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3935b5b39d54577a64aa280accbb5fee.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6254fdf3ab25161b65f5c86c6c42d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e23ab2a5db0d58b522f1e2699bfe60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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