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轨迹2016.4.16
Author:
DongHai Zhang
三角形内心
GeoGebra
New Resources
判斷球體
小数 的副本
兩位數除以一位數（一）
異分母分數減法
畫出對稱圖形
Discover Resources
臺北區104-2
立體圖形
Introduction of pH
纏繞畫2
小正多边形在大正多边形内的滚动（边长不相等）
Discover Topics
Rotation
Constructions
Linear Programming or Linear Optimization
Inequalities
Pie Chart or Circle Chart