如图,在平面内有四点A、B、C、D.
连接AC
画射线BA
作直线BC
在直线BC上找一点E,使得
最小,理由为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e636bddc1a3d7c006ac304e96cd2551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1978ee52fbcfe871eb1dfdb0c11ba60e.png)
![](https://img.xkw.com/dksih/QBM/2018/7/24/1995471829024768/2001122276941824/STEM/451c9e0d10a848e1ab3ef30647b013b8.png?resizew=129)
更新时间:2018-08-01 16:36:36
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【知识点】 画出直线、射线、线段解读
相似题推荐
解答题-问答题
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适中
(0.65)
【推荐1】如图,已知线段AB.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896518781591552/2960647588249600/STEM/de1d4d28-f07a-4646-b040-3fd31b14e68b.png?resizew=118)
(1)利用刻度尺画图:延长线段AB到点C,使BC=
AB,取线段AC的中点D.
(2)若BC=8,求线段BD的长.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896518781591552/2960647588249600/STEM/de1d4d28-f07a-4646-b040-3fd31b14e68b.png?resizew=118)
(1)利用刻度尺画图:延长线段AB到点C,使BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)若BC=8,求线段BD的长.
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解答题-作图题
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适中
(0.65)
【推荐2】如图,已知点A,B,C,D.请用直尺和圆规作图(保留作图痕迹):
![](https://img.xkw.com/dksih/QBM/2019/12/3/2347168950444032/2348450115764224/STEM/86083c8049a0457a9ff3ccfbfe0ce5ac.png?resizew=113)
(1)画出直线AB,射线AD,及线段BD;
(2)在射线AD上画出点E,使得AE=AB+BD;
(3)在线段BD上取点M,使MA+MC的值最小.
![](https://img.xkw.com/dksih/QBM/2019/12/3/2347168950444032/2348450115764224/STEM/86083c8049a0457a9ff3ccfbfe0ce5ac.png?resizew=113)
(1)画出直线AB,射线AD,及线段BD;
(2)在射线AD上画出点E,使得AE=AB+BD;
(3)在线段BD上取点M,使MA+MC的值最小.
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