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折射率的定義
Author:
Jia-ming Shiu
可以移動G、E、F 看出折射率的算法
GeoGebra
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三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
三位數除以一位數（二）
算柱 (兩位數)
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輪盤輪盤
Q2-3
椭圆的定义
圆锥侧面展开
橢圓規Ellipsograph of Parallelogram
Discover Topics
Addition
Difference and Slope
Constructions
Reflection
Similarity Transformation or Similarity