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交流电的模拟
Author:
孟宝兴
GeoGebra
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三位數除以一位數（二）
画直线等分三角形的面积
拼砌四邊形
兩組對邊相等的四邊形
畫出對稱圖形
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testing
二元一次不等式
平移法（一）
比較利益
圓周_心算題01
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Circumcircle or Circumscribed Circle
Means
Area
Equations
Quadrilaterals