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图案A
Author:
吉顺国
GeoGebra
New Resources
兩位數加法
三位數除以一位數（二）
四邊形的特性
四邉形 (四年級) 教師版
畫出對稱圖形
Discover Resources
了解圓方程(0)
圓內正方形夾小圓
Math
circle: line from centre
多邊形的面積
Discover Topics
Inequalities
Circle
Surface
General Quadrilateral
Difference and Slope