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错觉2
Author:
谢鹏
GeoGebra
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直線的斜率
多邊形的面積
空间中两直线的位置关系
漂亮的摇摆曲线
球体的体积推导
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國徽
圓內冪性質
弧度制的由来
Copy of 包含除法（1 ÷分數）
翰林數學_2下_CH4-1_截線與截角的意義
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Trapezoid
Solids or 3D Shapes
Percentages
Right Triangles
Distributions