已知正方体
的棱长为2,E为线段
中点,F为线段BC上动点,则(1)
的最小值为______ ;(2)点F到直线DE距离的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a80cf9882b9c4b237d2bbc133b1ac4d0.png)
更新时间:2022-02-13 16:23:51
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【推荐1】我们知道平面直角坐标系内直线的一般式方程为
,对此进行类比,可知空间直角坐标系内平面的一般方程为
;运用上述知识,已知实数
,
,
满足
,则
的最小值是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01fa45cefa203889bab7f3b68c60b02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a83e5d490ea07656d457fb3d81d4e82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794361beee8b56d9bf49d8d6a0990811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97502047959344e89522d31c05deff35.png)
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【推荐2】如图,正方体
则下列四个命题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/d50c3f55-5bce-42e5-b856-191bf4611727.png?resizew=193)
①点
在直线
上运动,三棱锥
的体积不变;
②点
在直线
上运动,直线
与平面
所成角的大小不变;
③点
在直线
上运动,二面角
的大小不变;
④点
是平面
上到点
和
距离相等的动点,则
的轨迹是过点
的一条直线;
其中的真命题是________ (请在横线上填上正确命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/d50c3f55-5bce-42e5-b856-191bf4611727.png?resizew=193)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad99ef5e70de37345c708b758d545f.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67094912ebf6dd7b27b835af55df4826.png)
④点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
其中的真命题是
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解题方法
【推荐1】在空间直角坐标系中,点
关于
轴的对称点为点
,则点
到直线
的距离为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a746c2759c06fd94b167fe63a22e64e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642abd464232937a2d8e6ebc70273f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解题方法
【推荐2】在空间直角坐标系
中,
,则点
到直线
的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a834024400d0730af3e640ca4d5f54b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5997c3beaf795fd8e9dbc1016e8fd41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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