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三棱锥的三视图
Author:
DongHai Zhang
GeoGebra
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四邊形的特性
異分母分數減法
【案例】2018年全国1卷理科12题
錐體建築師
三位數除以一位數（一）
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七巧板
二次函數圖形與兩軸的交點
Copy of 十行表
賺賠：例2的副本
数一数这是几边形
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Parabola
Interest Calculation
Upper and Lower Sum or Riemann Sum
Plane Figures or Shapes
Random Experiments