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Author:
chen mingchuan
GeoGebra
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異分母分數減法
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
兩位數除以一位數（二）
四邉形 (四年級) 教師版
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直方圖_for_student
Is this a prism 13
畢氏定理變裝證明
規律物件
[洋葱] 相似与全等
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Orthocenter
Linear Equations
Unit Circle
Upper and Lower Sum or Riemann Sum
Square