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Author:
chen mingchuan
GeoGebra
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三位數除以一位數（二）
拼砌四邊形
異分母分數減法
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
Discover Resources
Construct a regular pentagon
isosceles triangle construction
Graph of Sine Function 正弦函數圖像
兩圓內公切線
三角函數圖形（全）的副本
Discover Topics
Orthocenter
Indefinite Integral
Subtraction
Equations
Means