如图所示的四棱锥
中,
平面
,底面
为直角梯形,
,点E为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/fa60c2a7-5dad-442e-908e-bafa7eff8164.png?resizew=187)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
平面
;
(2)求点A到平面
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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a062a75a2b6c303b216e9e5fd12356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/fa60c2a7-5dad-442e-908e-bafa7eff8164.png?resizew=187)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求点A到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
更新时间:2023-04-09 15:48:47
|
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,四边形
为矩形,
四点共面,且
和
均为等腰直角三角形,
,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65326a1ec45788dd80ce42f2ffde7463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa28e190f3bc96fd0a385471d123a46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4922fd0a7b94f2577ccbf90218f9f64e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/d8bccaca-4434-4c1e-9bd8-d5df312e114a.png?resizew=158)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在直三棱柱
中,
分别为
的中点
∥平面
;
(2)若
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5d06f560896269c364966bdbfd9658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5307e04a84a0621e4d5bd2aaa1980ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a01298ec90ac8bc0fe14d04068fcd6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7372e7119ab0964121062bc24339a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a01298ec90ac8bc0fe14d04068fcd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e363082228a653eb5b0dbc3c6161a9c9.png)
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在直三棱柱
中,
,D为
的中点,
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/7b540f5d-3dc2-46e0-ac77-f59f0630156c.png?resizew=154)
(1)证明:
∥平面
;
(2)若
,
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d798b7b2ca788ec08967358c271406f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/7b540f5d-3dc2-46e0-ac77-f59f0630156c.png?resizew=154)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b886daa3c9bb7153acd9f651f99eb2c1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4195ed4a942092a90895d5e70e713a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b886daa3c9bb7153acd9f651f99eb2c1.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图
,在直角梯形
中,
,
,
,点
为
中点.将
沿
折起, 使平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
平面
,得到几何体
,如图
所示.
![](https://img.xkw.com/dksih/QBM/2016/11/26/1573187690102784/1573187695697920/STEM/f9fa729f98a345a6bf1174ba9da8d4b2.png)
![](https://img.xkw.com/dksih/QBM/2016/11/26/1573187690102784/1573187695697920/STEM/878a126192f746f3967030f887d9d807.png)
(I)在
上找一点
,使
平面
;
(II)求点
到平面
的距离.
![](https://img.xkw.com/dksih/QBM/2016/11/26/1573187690102784/1573187695697920/STEM/04e4199a32544ca79a93deac97f352ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98c8e36238ad90378e724466fcb6023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a0680ad91a91b1669c58436edee993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbced129627233661d88e9663a9e13c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://img.xkw.com/dksih/QBM/2016/11/26/1573187690102784/1573187695697920/STEM/1894d6a8c2694707a7eeb00c6493d239.png)
![](https://img.xkw.com/dksih/QBM/2016/11/26/1573187690102784/1573187695697920/STEM/f9fa729f98a345a6bf1174ba9da8d4b2.png)
![](https://img.xkw.com/dksih/QBM/2016/11/26/1573187690102784/1573187695697920/STEM/878a126192f746f3967030f887d9d807.png)
(I)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810ee7bc82b6f452afb3fc18691abc3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f7ff90e26ff382aa7b709955ad1b9.png)
(II)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999049b224b73761ce28e12556bfeb93.png)
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