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Author:
Billy Cheung
GeoGebra
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百分數及其應用
球体的截面
活动三:应用性质
镂空正方体案例对比
龙形曲线-分形龙2
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扇形面積公式2
梯形面積 Area of Trapezium
group m
摺正三角形
小正多边形在大正多边形内的滚动(边长相等)
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Surface
Matrices
Parabola
Upper and Lower Sum or Riemann Sum
Ellipse