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保持比例

Author:hjyanghj

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兩位數除以一位數（二）
四邊形的特性
算柱 (兩位數)
三位數除以一位數（二）
三位數除以一位數（一）

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圓的展開partI
DSE Circle-ACT01C Distance between Chords and Centre of a Circle
指令
重心
数学分析讲义

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Statistics
Continuity
Plane Figures or Shapes
Similarity Transformation or Similarity
Logarithm

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