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同心圓
Author:
許清惟
GeoGebra
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兩位數加法
算柱 (兩位數)
【案例】2013年安徽高考15题
四邉形 (四年級) 教師版
兩位數除以一位數(一)
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PMC 2014-15 Q4
觀察對數的對稱性
國旗
圓和弦圓和弦的副本
带电粒子——旋转圆
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Sequences and Series
Translation
Similarity Transformation or Similarity
Indefinite Integral
Line Segment