如图,长方体
中,
,
,M是
的中点.
(1)求证:
;
(2)求证:
∥平面
;
(3)点P是棱
上的动点,求
的最小值,并说明此时点P的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5213d6ac74fb6044cab6927a3d2acaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/c7d809fc-e74c-4473-a404-7b35d24f8e86.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc0db58fa5df4b9fa18dde8af446819.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a1c6340bb12cc1bbcda66ac6745fdc3.png)
(3)点P是棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e5da529d800eb01fb8bd433c5dda9a.png)
22-23高一下·辽宁锦州·期末 查看更多[2]
更新时间:2023-07-13 09:54:56
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在正三棱柱 ABC A1 B1C1 中, AB 3 , AA1 4 , M 为 AA1 的中点, P 是 BC 上一点,且由 P 沿棱柱侧面经过棱 CC1 到 M 点的最短路线长为
,设这条最短路线与 CC1 的交点为 N .求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/f65c3984-26c6-406a-98bc-9e05c4cdcb44.png?resizew=122)
(1)该三棱柱的侧面展开图的对角线长;
(2) PC 和 NC 的长;
(3)平面 NMP 和平面 ABC 所成锐二面角大小的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6ad68f10f098feda5d9b94636bf752.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/f65c3984-26c6-406a-98bc-9e05c4cdcb44.png?resizew=122)
(1)该三棱柱的侧面展开图的对角线长;
(2) PC 和 NC 的长;
(3)平面 NMP 和平面 ABC 所成锐二面角大小的正切值.
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适中
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【推荐2】在直三棱柱
中,底面为直角三角形,
,
,
,
是
上一动点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be3d85716c301231663fd71b697a4a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b137cfdfd49c53ebe14992115d604422.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在四棱锥
中,
平面
,
,
,
,
,点
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/10/230ec99d-09e4-4131-bda0-9823a2aad235.png?resizew=166)
(1)证明:
平面
;
(2)当二面角
的余弦值为
时,求点
到直线
的距离.
![](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/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25eb757d05fbff80d50c3bb8dbcb8657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.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/47d669df6c391aa83150df5ae96c39d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/10/230ec99d-09e4-4131-bda0-9823a2aad235.png?resizew=166)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826bf6fa3706921b77ad0eb4fcc206bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)当二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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】如图,在直三棱柱
中,
是以
为斜边的等腰直角三角形,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/ca6e1a1b-f0e5-4635-acc2-9991987aae96.png?resizew=193)
(1)证明:
平面
.
(2)若四边形
是面积为
的正方形,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef19f98e86ae7504671413780b3b1a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f8f6bad19ae6e30ebb0128a55b9292.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/ca6e1a1b-f0e5-4635-acc2-9991987aae96.png?resizew=193)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75844725734f498eb983fe76cece2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6b3ca56379a9da9411cc0dbd4f978f.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6b3ca56379a9da9411cc0dbd4f978f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在四棱锥
中,
平面
,四边形
是平行四边形,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/783f1c96-84f6-4da8-b6da-1aaa29c8aeaf.png?resizew=210)
(1)求证:
;
(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/5a1b49f64e0065edad868b25e9fcada3.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/c0ce06dbe9e1177468781ba4aff85ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc7898b038de3f1ed87ebd0d94f90fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/783f1c96-84f6-4da8-b6da-1aaa29c8aeaf.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
您最近一年使用:0次
解答题
|
适中
(0.65)
解题方法
【推荐2】如图,正四棱锥
中,
,侧棱
与底面
所成角的正切值为
.
(1)求侧面
与底面
所成二面角的大小;
(2)若
是
中点,求异面直线
与
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839c7616cd0d90265f4b2c9c021254fe.png)
(1)求侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/664b2374-5a7b-4b0c-8335-8e2365583a5e.png?resizew=172)
您最近一年使用:0次