如图,已知正方体
的棱长为1,
与
交于点
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c401f9dd333b36433b56d7aef1ffc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4cd2b33bd983a9ed6575b9de04a46a.png)
22-23高一·全国·课后作业 查看更多[3]
(已下线)8.6.1 空间直线、平面的垂直(精练)-2022-2023学年高一数学一隅三反系列(人教A版2019必修第二册)(已下线)10.3 直线与平面间的位置关系(第2课时)(七大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020必修第三册)(已下线)8.6.1直线与直线垂直+8.6.2直线与平面垂直——课后作业(提升版)
更新时间:2023-03-14 23:53:32
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解答题-证明题
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【推荐1】如图,在底面为直角梯形的四棱锥
中,
平面
,
.求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffbb040ec738f33c48e2920af50df13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b514bbc1f194d807b0b445f066b9ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/7695554b-889a-480d-a3ad-4491b7484169.png?resizew=192)
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【推荐2】如图,四棱锥
的底面是边长为2的菱形,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/f2e905d8-3981-45c9-b2df-ccea4aa6b574.png?resizew=171)
(1)证明:
;
(2)若
,直线
与平面
所成角为
,求四棱锥
的体积.
![](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://img.xkw.com/dksih/QBM/editorImg/2022/12/23/f2e905d8-3981-45c9-b2df-ccea4aa6b574.png?resizew=171)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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【推荐1】如图,在直三棱柱
中,
,
、
分别是棱
,
的中点,求证:
![](https://img.xkw.com/dksih/QBM/2020/11/14/2592904727773184/2593270642688000/STEM/c68fb477def9454194056d0eecf01695.png?resizew=167)
(1)
平面
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1833908f4db7c8dd708b75b9cade819a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/2020/11/14/2592904727773184/2593270642688000/STEM/c68fb477def9454194056d0eecf01695.png?resizew=167)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281db65d019f6f77dc0dfcc675ce93d1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ccdd87b7ea0667fb405c305c6a497a.png)
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【推荐2】如图,在三棱锥O-ABC中,OA,OB,OC两两互相垂直,OA=OB,且D,E,F分别为AC,BC,AB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/68dbcaa4-00f5-4eb1-ba14-93cbba5c0e16.png?resizew=143)
(1)求证:
平面AOB;
(2)求证:AB⊥平面OCF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/68dbcaa4-00f5-4eb1-ba14-93cbba5c0e16.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c42f59705e0d18d0bd12320c5400a1.png)
(2)求证:AB⊥平面OCF.
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