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Author:JoshuaCheung

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兩組對邊相等的四邊形
判斷球體
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
画直线等分三角形的面积

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動畫
test01
軌跡方程式-垂直切線
Ex5C#15
AMC

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Sine
Optimization Problems
Triangles
Normal Distribution
Inequalities

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