如图,
平面
,四边形
是矩形,四边形
为直角梯形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893817730326528/2897329335853056/STEM/3f6e78b7-47fa-44ca-9d56-66da4ea45024.png?resizew=186)
(1)求证:
平面
;
(2)求平面
与平面
夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be082aedbea135ea8fdcadca2cf427b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbde67cc84757b10bb66c47cee22de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f556bd2f45143b3ef33f411ecefe7555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c543f560d8a91d5d60c96feebff9ae50.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893817730326528/2897329335853056/STEM/3f6e78b7-47fa-44ca-9d56-66da4ea45024.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a4a94e889d2869ea84082575fae52ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
更新时间:2022-01-18 21:34:32
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】在直三棱柱ABCA1B1C1中,AC=3,BC=4,AB=5,AA1=4.
(1)求证:AC⊥BC1;
(2)在AB上是否存在点D,使得AC1⊥CD?
(3)在AB上是否存在点D,使得AC1//平面CDB1?
(1)求证:AC⊥BC1;
(2)在AB上是否存在点D,使得AC1⊥CD?
(3)在AB上是否存在点D,使得AC1//平面CDB1?
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,四棱锥
的底面是矩形,
平面
,
,
,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/5e2c3d19-53b3-4912-a961-09c5fe33d9b7.png?resizew=172)
(1)若点
为棱
的中点,证明:平面
平面
.
(2)线段
上是否存在一点
,使直线
与平面
所成角的正弦值为
,若存在,求出线段
的长,若不存在,说明理由.
![](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/ffddeafce03aae663bc823e2d5127c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/5e2c3d19-53b3-4912-a961-09c5fe33d9b7.png?resizew=172)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392469b357b12b998528499929366c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)线段
![](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/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf91e7449e859f06f73cf6d487d75f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐3】如图,正方形
边长为1,
平面
,
平面
,且
(
,
在平面
同侧),
为线段
上的动点.
![](https://img.xkw.com/dksih/QBM/2021/1/18/2638808354422784/2642328507834368/STEM/bbd7bebc-2cd6-4f07-aee5-0d10dca45333.png?resizew=268)
(1)求证:
;
(2)求
的最小值,并求取得最小值时二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a38e6c6dfde2b19b6b47f35a439a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1d3de310412c0fa445acd2cdb61513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc1ce55b1e716fa536a5ec300e2725f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/2021/1/18/2638808354422784/2642328507834368/STEM/bbd7bebc-2cd6-4f07-aee5-0d10dca45333.png?resizew=268)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37a450636672d5a6b202d42aa3a1f51.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82392ad71d81c40b6c0f0f996dcc9fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b7d5e5f6e97f716fb68cd628352a67.png)
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解答题-作图题
|
适中
(0.65)
【推荐1】已知边长为3的正方体
(如图),现用一个平面
截该正方体,平面
与棱
、
、
分别交于点
、
、
.若
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/9ff3b335-cee1-455b-a07f-8e7637ecb8c9.jpg?resizew=195)
(1)求面
与面
所成锐二面角的余弦值;
(2)请在答题卷的第2个图中作出截面
与正方体各面的交线,用字母标识出交线与棱的交点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1586681cc763024b659b07dc4ccd02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f31a3724c639f88486f8356ca65397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0add97c20dbfc86bcfa651b21356fc1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/9ff3b335-cee1-455b-a07f-8e7637ecb8c9.jpg?resizew=195)
(1)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)请在答题卷的第2个图中作出截面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在四棱锥
中,底面
是正方形,侧棱
底面
,
,E是
的中点,作
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/f283e714-e8d6-4a19-bfb0-cc02e61b1cb5.png?resizew=152)
(1).证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
平面
;
(2)证明:
平面
;
(3)求二面角
的大小.
![](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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d4c42112e0a22f240ce2ae432e5b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/f283e714-e8d6-4a19-bfb0-cc02e61b1cb5.png?resizew=152)
(1).证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466fabcaac59132fea648ff35342ec9d.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebce46aeb97373353179e5669365fa4a.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b8c75b0e52a073e9271ed93465b861.png)
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解答题-证明题
|
适中
(0.65)
【推荐3】如图,在平面四边形
中,
和
都是等腰直角三角形且
,正方形
的边
.
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481f38563c5191cb433ffc0c739ff761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a47dcb24ffe20e8153e0d113ff8bee3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b123303738a595ec0126beb0fa64a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/00a4d9e8-def0-4d6b-b3f5-f39839581a92.png?resizew=203)
您最近一年使用:0次