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Author:
陳科旭
GeoGebra
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兩組對邊相等的四邊形
異分母分數減法
四邉形 (四年級) 教師版
兩位數除以一位數（一）
三位數除以一位數（一）
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切線斜率
掃描不等式圖
托勒密定理的應用
工具：PlaneArrows, PlaneText... (v.2)
分數乘法列式練習
Discover Topics
Piecewise Functions
Geometric Mean
Vectors 2D (Two-Dimensional)
Continuity
Perimeter