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追击问题
Author:
凉 清
GeoGebra
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找出對稱軸
算柱 (兩位數)
柱體建築師
兩位數除以一位數（一）
兩組對邊相等的四邊形
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三角形的工具
抛物线的参数方程
集合的小结
梯形面積(求上底)
【立体字】劳动节5.1
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Function Graph
Mathematics
Centroid or Barycenter
Line Segment
Limits