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三節棍
Author:
chen mingchuan
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數除以一位數（二）
第八周作业
畫出對稱圖形
GeoGebra笔记功能体验课件
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三角形的重心
isosceles triangle construction
兩圓外公切線
COVID-19 折線圖
扇形滚动(圆心角半径可变)
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Terms
Tangent Line or Tangent
Trapezoid
Diagrams
Quadrilaterals