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平面鏡成像 Image of Plane Mirror Reflection
Author:
W.L. Wong, Albert
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
拼砌四邊形
【案例】2018年全国1卷理科12题
兩位數加法
Discover Resources
Fraction to Decimal
Copy of 閱讀鐘面及數字鐘（時和分）
三角
blue
我的第一个GGB绘本
Discover Topics
Pyramid
Symmetry
Hypergeometric Distribution
Plane Figures or Shapes
Subtraction