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多边形旋
Author:
赵林
GeoGebra
New Resources
三位數除以一位數（一）
畫出對稱圖形
【案例】2018年全国1卷理科12题
兩位數除以一位數（二）
兩組對邊相等的四邊形
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阿基米德(3,10,10)
Reflectional Symmetry 反射對稱
Compare areas by cutting shapes Q1
拋物線的幾何性質
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Ellipse
Mathematics
Subtraction
Kite
Percentages