如图,长方体
中,
,
是
上一点,
,平面
交棱
于点
,
的长为_______ ,
是
上一点,且
平面
,则
的长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a0e3d48c8342128570c53b00d535c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43cbc92b5f5c26c7f70b52b27616a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c99cda5a272bbe32b28575fa51b9f6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43cbc92b5f5c26c7f70b52b27616a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/2022/4/6/2952475869536256/2953109905997824/STEM/80af61cc198449d69702501afcfcd405.png?resizew=171)
更新时间:2022-04-07 17:00:23
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【推荐1】已知四面体
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【推荐2】如图,长方体
中,AB=BC=4,
,M是线段
的中点,点N在线段
上,MN
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被平面AMN所截得的截面面积为___________ .
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【推荐1】下列三个命题在“_______”处都缺少同一个条件,补上这个条件使其构成真命题(其中
为直线,
为平面),则此条件是__________ .
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f104d4a53977c1ea85e5c25e48f42b3b.png)
;②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc578e5eed382998beddbee8abe2c84.png)
;③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7b40d39035648082f9efbbc744b331.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f104d4a53977c1ea85e5c25e48f42b3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0fb2a16acf5e25e8630e89a4a69520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc578e5eed382998beddbee8abe2c84.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7b40d39035648082f9efbbc744b331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0fb2a16acf5e25e8630e89a4a69520.png)
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名校
解题方法
【推荐2】已知正四棱柱
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【推荐3】已知平面
和直线
,给出条件:
①
;②
;③
;④
;⑤
.
(1)当满足条件_________ 时,有
;
(2)当满足条件________ 时,有
.(填所选条件的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa404d3ff313b0a28a76a48d7d87234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34512482dc6ca8f32d80e4b37d64086b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539a38ada26356d73024fb8533449c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de666db0febae223cc4d1dc189d71ca6.png)
(1)当满足条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713288c700aee0f6f797e06760466185.png)
(2)当满足条件
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