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两平面夹角1
Author:
刘莹
GeoGebra
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算柱 (兩位數)
【案例】2013年安徽高考15题
兩位數加法
【案例】2018年全国1卷理科12题
四邊形的特性
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根據百分率找數量（二）: 例2
讀磅
Distributive Law 2 (分配率 2)
包含除法（1 ÷分數）的副本
分割正方体
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Incircle or Inscribed Circle
Quadratic Functions
Real Numbers
Equilateral Triangles
Parallelogram