如图,E、F分别是空间四边形
中边
和
的中点,过
平行于
的平面与
交于点
.求证:
是
中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
22-23高一·全国·课后作业 查看更多[5]
沪教版(2020) 必修第三册 高效课堂 第十章 10.3直线与平面位置关系(1)(已下线)空间直线、平面的平行(已下线)8.5.2 直线与平面平行(精讲)-【题型分类归纳】2022-2023学年高一数学同步讲与练(人教A版2019必修第二册)(已下线)核心考点07空间直线、平面的平行-【满分全攻略】2022-2023学年高一数学下学期核心考点+重难点讲练与测试(人教A版2019必修第二册)(已下线)6.4 .1 直线与平面平行-同步精品课堂(北师大版2019必修第二册)
更新时间:2023-02-06 13:47:39
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【推荐1】如图,在长方体ABCD-A1B1C1D1中,E,F分别为BC,CC1的中点,AB=AD=2,AA1=3.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/1587974a-38f7-49a0-8c58-8cb2b644afcb.png?resizew=173)
(1)证明:EF∥平面A1ADD1;
(2)求直线AC1与平面A1ADD1所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/1587974a-38f7-49a0-8c58-8cb2b644afcb.png?resizew=173)
(1)证明:EF∥平面A1ADD1;
(2)求直线AC1与平面A1ADD1所成角的正弦值.
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【推荐2】已知E、F、G、H为空间四边形ABCD的边AB、BC、CD、DA上的点, 且EH∥FG.求证:EH∥BD.
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792262417530880/1793795300515840/STEM/ce30eccba97c4c3a98ed897277e01423.png?resizew=129)
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【推荐3】如图,在正方体
中,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/10/2976275944808448/2977317381554176/STEM/5040b494f43d404b932517eac71ca3f3.png?resizew=189)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/10/2976275944808448/2977317381554176/STEM/5040b494f43d404b932517eac71ca3f3.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb689000fa7a3b425be3196d8b0f32af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f233b375753611ffa7a93c2c12ef5e28.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270a2ff49366962834dbec2d3bc2d9a7.png)
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【推荐1】如图,在四棱锥
中,平面
平面
,四边形
为等腰梯形,且
,
为等边三角形,平面
平面
直线
.证明:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.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/83d8af1e40a1febb02025c503a1fcf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1084a42a7b7600ac9651a023de6d3401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d86d203d7c9c234210070a15117154e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23976db53f05b3d5d791c4d736a7184d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,在五面体
中,平面
平面
,四边形
为直角梯形,其中
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/e84cebe7-8423-4c64-9e24-bc159ff36b1e.png?resizew=191)
(1)求证:
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec43f7352b3a8c194b4c37485fb4ffd8.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/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c800b6aabdc453e2c7e343061e9c6a78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc91db43eea9ba6f29cb5719e26fa34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574cbcf8ccf5418d1871fb74bb61ee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9f10d4ebbc23dacfde5ac5854eed5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/e84cebe7-8423-4c64-9e24-bc159ff36b1e.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117878cbd8c00f2aabcdf62b487e2dc7.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0b72906641ed13716cfbce50923282.png)
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