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梯形有甚麼特性？
Author:
Anthony OR 柯志明
English version:
http://ggbtu.be/m79855
GeoGebra
New Resources
算柱 (兩位數)
異分母分數減法
兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
找出對稱軸
Discover Resources
軌跡二︰移動點與兩固定點保持相等距離(垂直平分線)
小学奥数
laptop height
兩函數間面積 的複本
圆锥曲线的产生
Discover Topics
Incircle or Inscribed Circle
Pie Chart or Circle Chart
Intersection
Line Segment
Upper and Lower Sum or Riemann Sum