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[几何] 求一道几何作图题

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几何小迷 posted 2016-7-21 21:52 |Read mode
Last edited by 几何小迷 2016-7-22 23:24已知锐角△ABC,求作:AB上一点D,AC上一点E,使得BD=DE=EC

要求尺规作图

这道题是从今年天津中考18题想的
今天看了今年天津中考的18题,网格做图的题,想知道不用网格是不是直接尺规也可以做出来呢?

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isee posted 2016-7-22 21:41
这个退到边长为3,4,5,在4的对角上来作都不好作。

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original poster 几何小迷 posted 2016-7-22 23:27
在问题下面给了一个人的作图方法,但是真心看不懂。

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abababa posted 2016-7-23 13:19
发网友的解答,用代数方法作的,到是看懂了,在Geogebra里画图也确实作出来了,但太复杂了。
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