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[几何] 图形翻折问题+函数方程

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facebooker posted 2019-5-21 15:36 |Read mode

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拜托各位给点思路吧谢谢。

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乌贼 posted 2019-5-21 20:13

9题没看明白$\theta $为啥为$\angle ADE$最小值，只知道$\angle ADE$取值范围为$[27\du ,108\du ]$

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2025-7-15 13:53 GMT+8

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