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倍长中线大法
Author:
hedaomiao
GeoGebra
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兩位數除以一位數（一）
平行線的斜率
祖冲之的期望：内棋与外棋
球体的体积推导
垂直線的斜率
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滑桿動畫
三次函數01
數學傳播39卷4期, 平面幾何公式思考
a sin(bx+c) + d 的圖形的副本
【初中】动点问题
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Incircle or Inscribed Circle
Addition
Similar Triangles
Pyramid
Diagrams