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Author:
chen mingchuan
GeoGebra
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直角坐標平面上的旋轉變換
球體建築師
異分母分數減法
拼砌四邊形
三位數除以一位數（一）
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二次曲線-1.圓錐曲線
Ambiguous Cylinder Illusion
S6 3D Basic Concept
Gradient of tangent
沪教版练习册7.4第4题
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Statistics
Curve Sketching
Secant Line or Secant
Step Functions
Natural Numbers