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sin,cos比大小
Author:
Lunxin Liu
GeoGebra
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直線的斜率
空间中两直线的位置关系
圓周公式的應用
異分母分數減法
三位數除以一位數（二）
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到正四面體頂點的平方和
Book
Primeter
劉徽的「割圓術」 的複本
翰林數學_1下_CH2-1_直角坐標平面的認識
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Division
Surface
Difference and Slope
Addition
Histogram