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螢橋國中
GeoGebra
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兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
祖冲之的期望：内棋与外棋
圓的切線方程
多邊形的面積
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proof24 羅文頡
Klein Bottle
Angle Sum of Triangle
Parallel lines
绕圆旋转004
Discover Topics
Vectors 2D (Two-Dimensional)
Quadratic Equations
Plane Figures or Shapes
Upper and Lower Sum or Riemann Sum
Histogram