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Author:
Ricky Chan
GeoGebra
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直角坐標平面上的旋轉變換
異分母分數減法
兩位數除以一位數（二）
四邊形的特性
兩組對邊相等和有直角的四邊形
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圓周 (圖形B)
正n凸多邊形旋轉對稱／反射對稱
y=2^x
基礎作圖1
初二春季课程
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Means
Natural Numbers
Rhombus
Parallelogram
Difference and Slope