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GeoGebra
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異分母分數減法
兩位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
拼砌四邊形
四邊形的特性
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winter vacation homework 9
My first Geogebra Book
Indices 5
複合棒形圖
小学一年级上（人教版）
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Random Variables
Algebra
Centroid or Barycenter
Pie Chart or Circle Chart
Logic