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乘法公式1
Author:
李春培
乘法公式
GeoGebra
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探究三角形的全等條件
【案例】2018年全国1卷理科12题
垂直線的斜率
兩位數除以一位數（二）
漂亮的摇摆曲线
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圓和弦圓和弦
堆疊正立方體
五角星动画
最短距離
gmj106a13 八角錐
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Curve Sketching
Kite
Natural Numbers
Circumcircle or Circumscribed Circle
Straight Lines