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[洋葱] 2018广州25 固定角度求长度
Author:
洋葱教研
GeoGebra
New Resources
找出對稱軸
四邊形的特性
異分母分數減法
兩位數除以一位數（二）
兩位數加法
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兩正弦波的合成波
線對稱圖形練習1
周界-平移法(練習一)
Sunline
剪切成正三棱柱（制作：李三军，修订：孟宝兴）
Discover Topics
Trigonometry
Constructions
Circumcircle or Circumscribed Circle
Difference and Slope
Quadrilaterals