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異分母分數加減
Author:
Lttcmooc
GeoGebra
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兩位數加法
平行線的斜率
直線的斜率
漂亮的摇摆曲线
三位數除以一位數（二）
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三角形與邊上一點求正三角形
labyrinth
摩天輪
quiz 9.1 1(d)
Dodecahedron
Discover Topics
Root
Plane Figures or Shapes
Sine
Median Value
Derivative