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同心圓
Author:
許清惟
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數加法
拼砌四邊形
異分母分數減法
兩組對邊相等的四邊形
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Copy of 3S2 01a 平行四邊形 20151207
指數1209
纏繞畫未完
例题2（P点可拖动）
Quiz on Addition and Subtraction of Directed Numbers (1)
Discover Topics
Subtraction
Statistics
Geometric Transformations
Random Variables
Optimization Problems