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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
直角坐標平面上的旋轉變換
球體建築師
【案例】2013年安徽高考15题
兩位數加法
兩位數除以一位數（二）
Discover Resources
Angle between a Line and a Plane 投影與線面角
Tangent to a curve at a point
max2
极坐标系
拋物線代數性質,光學性質
Discover Topics
Geometric Mean
Tree Diagrams
Indefinite Integral
Addition
Parabola