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Author:
acchu
GeoGebra
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三位數除以一位數（一）
異分母分數減法
兩組對邊相等的四邊形
拼砌四邊形
四邊形的特性
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題 8
四角錐體的截面
ch14 p.30#31
拋物線的疊合
三角波傅立葉級數&有效值
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Tree Diagrams
Hyperbola
Polygons
Integers
Plane Figures or Shapes