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proof 49 黃彥淇
Author:
郭亮偉
GeoGebra
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兩位數除以一位數（一）
拼砌四邊形
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
畫出對稱圖形
Discover Resources
梯形
分段移動
Testing slope
绝对值加减的图像
欧拉线
Discover Topics
Linear Regression
Step Functions
Sphere
Congruence
Similarity Transformation or Similarity