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angle_c
Author:
Jimmy Ma
GeoGebra
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第三周作业效果演示
正方形雪花图案
平行線的判定
盈利與虧蝕
斐波那契螺旋弧线（表格法）
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草枝襬 敢羚羊
gjh-h02-01 歐幾里德的畢氏證明
Multiplication of Polynomials (多項式的乘法 2)
內心
初中数学教材配套资源【人教】
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Geometric Transformations
Cube
Optimization Problems
Orthocenter
Circumcircle or Circumscribed Circle