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视觉差，平行线
Author:
汪丽
GeoGebra
New Resources
【案例】2013年安徽高考15题
兩位數除以一位數（一）
找出對稱軸
兩組對邊相等的四邊形
第八周作业
Discover Resources
孔明棋 (Peg Solitare)
Redefining Trigonometry by a Unit Circle
垂心應用
圖形C
抛豆实验
Discover Topics
Standard Deviation
Rotation
Geometry
Combinatorics
Hypothesis Testing