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平面区域的理解
Author:
GeoGebra Institute of WuXi
GeoGebra
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兩位數加法
画直线等分三角形的面积
三位數除以一位數（一）
拼砌四邊形
算柱 (兩位數)
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角α与-α的正弦函数关系
判斷球體 6
艾雪鑲嵌2
函數圖形
正四面體反射面
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Terms
Subtraction
Pythagoras or Pythagorean Theorem
Addition
Inequalities