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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
第八周作业
球體建築師
找出對稱軸
拼砌四邊形
異分母分數減法
Discover Resources
圆锥曲线包络
畢氏定理
gyz3d Hyperbolic Paraboloid
碎形
兩組對邊相等的四邊形（三年級）
Discover Topics
Histogram
Distributions
Trigonometric Functions
Arithmetic
Square