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math
3-1
math
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christinelinyunyun9
3-1
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3-1
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兩位數除以一位數（一）
兩位數加法
【案例】圆柱体内放置一个大球六个小球
錐體建築師
異分母分數減法
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Locus 軌跡(6T)
對稱和變換
[S2] a revised version of Jane’s GeoGebra file (modified by the author)
圆-视觉差
滑轮组2
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Inequalities
Multiplication
Trigonometric Functions
Diagrams
Orthocenter
