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交点个数1
Author:
朱亮
GeoGebra
New Resources
異分母分數減法
判斷球體
錐體建築師
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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折扣 例1
圖I
F1_Ch11.4_判定相似三角形
gjc090c23 圓內三角形與角度
congruent triangle_provided by Mr Yeung Kar Chun
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Special Points
Reflection
Interest Calculation
Normal Distribution
Multiplication