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黑白相间，视觉差异
Author:
汪丽
GeoGebra
New Resources
異分母分數減法
錐體建築師
三位數除以一位數（二）
拼砌四邊形
【案例】2013年安徽高考15题
Discover Resources
小學數學科 HTML5 Applets
垂直平分線
分數除法5: x ÷ a/b (包含)
判斷線型函數y=f(x)=ax+b的a值
ruler
Discover Topics
Solids or 3D Shapes
Division
Rational Numbers
Similar Triangles
Normal Distribution