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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
異分母分數減法
【案例】2013年安徽高考15题
畫出對稱圖形
sanjiaohanshu
三位數除以一位數（二）
Discover Resources
計算減法
奈格爾點與葛爾崗點互為等距共軛點
Copy of 方格紙上畫四邊形
四角柱體（長方體）的截面
椭圆的定义
Discover Topics
Solids or 3D Shapes
Similar Triangles
Straight Lines
Line Segment
Multiplication