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Area of Trapezium的副本
Author:
许强
,
Alex CHIK
GeoGebra
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三位數除以一位數（二）
三位數除以一位數（一）
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
兩位數加法
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Demonstration of the angles at the same segment
Homework3
Copy of 長方形與正方形的面積
立體圖形
一半模型归纳
Discover Topics
Tangent Function
Symmetry
Binomial Distribution
Integral Calculus
Rectangle