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waaachen
Author:
陳兪宏
孟哲老師解法
GeoGebra
New Resources
找出對稱軸
四邊形的特性
拼砌四邊形
近似值：有效數字
sanjiaohanshu
Discover Resources
相似三角形: 重溫
趙緹的GGB繪本
題10
mooc第四讲椭圆反射
相反数 思考（教材第10页）
Discover Topics
Straight Lines
Circumcircle or Circumscribed Circle
Vectors
Sequences and Series
Arithmetic Operations