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Properties of a Parallelogram
Author:
Lttcmooc
GeoGebra
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拼砌四邊形
異分母分數減法
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
兩位數除以一位數（一）
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七巧板
指數_1
二元一次圖形
公切線的引入
生长的海螺
Discover Topics
Similarity Transformation or Similarity
Logarithm
Terms
Root
Tangent Function