如图,直三棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/30/fbbe8043-4d8a-4125-87f9-67195bf87f43.png?resizew=304)
(1)证明:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ad3a578f403b9e6b97fa2dc955fc11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db57eca2a7cbd91bc57372592580a76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/30/fbbe8043-4d8a-4125-87f9-67195bf87f43.png?resizew=304)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469b7a1fe70476caa9b0f1a6a9c39c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
更新时间:2022-06-28 20:12:53
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,
平面
,
,
,
,
为棱
上的一点,且
.
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753337068912640/2781026583445504/STEM/3f5a48e2-9ad3-4511-8c46-37c90503e11c.png?resizew=283)
(1)证明:
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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c313dff515240bc75d42f6687ac44cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a50705a5a7329c78d611f6fb769c05.png)
![](https://img.xkw.com/dksih/QBM/2021/6/29/2753337068912640/2781026583445504/STEM/3f5a48e2-9ad3-4511-8c46-37c90503e11c.png?resizew=283)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f323421adf8083d252f0070f54f3a80.png)
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解答题-证明题
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名校
【推荐2】如图,在圆锥
中,
是圆
的直径,且
是边长为4的等边三角形,
为圆弧
的两个三等分点,
是
的中点.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
平面
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e5ef91fb27dd684a27ae7f1993cfba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e49817548cb45b3d1e58570644c6fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐3】如图,在四棱锥
中,底面
是直角梯形,侧棱
底面
,
垂直于
和
,
为棱
上的点,
,
.
![](https://img.xkw.com/dksih/QBM/2019/7/17/2248638978686976/2290766262083584/STEM/f5f00000-2c82-4494-bc1d-71d22f72cd71.png?resizew=238)
(1)若
为棱
的中点,求证:
//平面
;
(2)当
时,求平面
与平面
所成的锐二面角的余弦值;
(3)在第(2)问条件下,设点
是线段
上的动点,
与平面
所成的角为
,求当
取最大值时点
的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d11dd7422f4703763abc23d83c7584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://img.xkw.com/dksih/QBM/2019/7/17/2248638978686976/2290766262083584/STEM/f5f00000-2c82-4494-bc1d-71d22f72cd71.png?resizew=238)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615a52b70b6a47e57f0f6e0d91ca561a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
(3)在第(2)问条件下,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,四棱台
的底面是正方形,侧棱
垂直于底面,
.
![](https://img.xkw.com/dksih/QBM/2020/6/29/2494934790660096/2496994413355008/STEM/a934c2a0-e921-4c96-8d33-0e3296227881.png)
(1)证明:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2f738bbc161581e2229711e1d5fdd7.png)
![](https://img.xkw.com/dksih/QBM/2020/6/29/2494934790660096/2496994413355008/STEM/a934c2a0-e921-4c96-8d33-0e3296227881.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a55d553f1fbe1698872cfa61199e71.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dddfef906818cc8ddd00f867b77f227.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图,在圆柱W中,点
、
分别为上、下底面的圆心,平面
是轴截面,点H在上底面圆周上(异与N,F),点G为下底面圆弧
的中点,点H与点G在平面
的同侧,圆柱W的底面半径为1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/27085f31-1a53-4c18-ae1b-235accb055a4.png?resizew=142)
(1)若平面
平面
,证明
;
(2)若直线
平面
,求H到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8e1c05117a74de20bcc5d825b1c29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388cdd242d570658af1d8853a692c3a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8e1c05117a74de20bcc5d825b1c29d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/27085f31-1a53-4c18-ae1b-235accb055a4.png?resizew=142)
(1)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5be220774a3a9212d914f6d8b7b83e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf252d6b6870710f886f223640c88b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beea55954ee1af4dc6924c09014ebd9f.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15571be9d89c4d4446d2787fa5f3a298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57cd6cb0c23375fa34a4654508c6881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57cd6cb0c23375fa34a4654508c6881.png)
您最近一年使用:0次