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九點共圓

Author:廖奕翔

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異分母分數減法
找出對稱軸
sanjiaohanshu
兩組對邊相等的四邊形
兩位數除以一位數（一）

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現學現賣test
國旗
射线上滚动椭圆
橢圓2--四圓心近似法
函数作图工具的副本

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Probability
Similar Triangles
Volume
Difference and Slope
Natural Numbers

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