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happy birthday
Author:
李春培
happy birthday
GeoGebra
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畫出對稱圖形
【案例】2013年安徽高考15题
兩位數除以一位數（二）
異分母分數減法
四邊形的特性
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chap. 1 by ck
cherry family
雙曲線的幾何性質
同位角__垂直平行綫
根據百分率找數量（二）: 例1的副本
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Numbers
Addition
Median Line
Upper and Lower Sum or Riemann Sum
Exponent