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櫻花鉤吻鮭
Author:
Lin Ching Chieh
GeoGebra
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三位數除以一位數（一）
球體建築師
算柱 (兩位數)
【案例】2018年全国1卷理科12题
画直线等分三角形的面积
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曲線下面積
Trajectory of system: y'=sin(y)-y/2
cherry family
mooc第四讲椭圆反射
圓的基本性質
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Distributions
Incircle or Inscribed Circle
Ellipse
Rectangle
Hyperbola