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正方形折纸减去两角
Author:
孟宝兴
GeoGebra
New Resources
四邉形 (四年級) 教師版
【案例】2013年安徽高考15题
畫出對稱圖形
兩位數除以一位數（一）
拼砌四邊形
Discover Resources
周界
Angles in a Circle:Property 3
圖形的周界 3
任意角的生成
奔马
Discover Topics
Poisson Distribution
LCM and GCD
Complex Numbers
Straight Lines
Area