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六上练习：时钟轨迹问题
Author:
肖昆明
GeoGebra
New Resources
三角函数 的副本
科氏力 (Coriolis Force)
祖冲之的期望：内棋与外棋
百分數及其應用
盈利與虧蝕
Discover Resources
Locus 軌跡(4T)
test02
臺北區104-2
數學電腦繪圖與解題
纏繞畫2
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Quadrilaterals
Sine
Root
Vectors 2D (Two-Dimensional)
Secant Line or Secant