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封閉區域著色
Author:
侯杰材
GeoGebra
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三位數除以一位數（一）
【案例】2018年全国1卷理科12题
兩位數加法
錐體建築師
畫出對稱圖形
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反射原理
柯西不等式 (2)
Copy of 固定周界的長方形的面積變化
congruent (SSS) 2
仰角和俯角
Discover Topics
Upper and Lower Sum or Riemann Sum
Arithmetic Mean
Dilation
Difference and Slope
Algebra