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选修一P139-9求垂线段中点的轨迹
Author:
jjx01
Topic:
Parabola
GeoGebra
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【案例】2018年全国1卷理科12题
畫出對稱圖形
兩位數加法
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
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三角形內角和
極限不存在(雙路徑法)
五角星动画
银币
兩位數加法
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Circle
Straight Lines
Pie Chart or Circle Chart
Step Functions
Hypergeometric Distribution