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congruent (SS) 2
Author:
Ricky Chan
GeoGebra
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兩組對邊相等的四邊形
直角坐標平面上的旋轉變換
【案例】2013年安徽高考15题
異分母分數減法
算柱 (兩位數)
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整數或分數÷分數_ 工作紙（一）_題2c
正多面體
圓錐曲線
解構正立方體
畢氏定理
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Difference and Slope
Orthocenter
Trigonometry
Histogram
Inequalities