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三角形重心軌跡(動點在三圓上)
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GeoGebra
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【案例】2018年全国1卷理科12题
GeoGebra笔记功能体验课件
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
兩位數除以一位數（一）
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Internal tangent
圓心
學習活動二之三解的圖形
多物件逐一動畫
Orthographic Views 1
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Optimization Problems
Parabola
Quadrilaterals
Rhombus
Random Experiments