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折扣 例2
Author:
GeoGebra Institute of Hong Kong
GeoGebra
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兩組對邊相等的四邊形
兩位數加法
【案例】2013年安徽高考15题
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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時鐘小幫手
數學傳播39卷4期, 平面幾何公式思考
基礎作圖2
椭圆的定义
蜗牛壳模型
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Inequalities
Calculus
Arithmetic Operations
Mode
Trigonometry