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[几何] 几何

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lrh2006 posted 2016-5-25 21:55 |Read mode
第3小题,哎,可以的话帮我看看吧,先谢谢了
mmexport1464184122244.jpg

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isee posted 2016-5-26 13:59
还真几何题了。

如图,一个Menelaus定理搞定。

snap02.JPG

$$\frac y{3-y}\cdot \frac x{4-x}\cdot \frac {5+y}y=1,$$
代入x值,算出y即可。

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kuing posted 2016-5-26 15:21
改了一下帖的标题,没多少函数的事了,明明是几何题……

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original poster lrh2006 posted 2016-5-27 13:39
回复 2# isee


    谢谢!不过没学过定理的初中生怎么办?

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original poster lrh2006 posted 2016-5-27 13:40
回复 3# kuing


    好吧,谢谢kuing,希望不要因为我发这些题目打我

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isee posted 2016-5-27 14:31
回复  isee


    谢谢!不过没学过定理的初中生怎么办?
lrh2006 发表于 2016-5-27 13:39
随便添加平行,利用相似来证。

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original poster lrh2006 posted 2016-5-30 09:46
回复 6# isee


    好的,谢谢

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