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勾股定理折叠问题
Author:
数豆豆
GeoGebra
New Resources
三角函数 的副本
龙形曲线-分形龙
异形操场
科赫雪花
平行線的判定
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任務1
正n凸多邊形旋轉對稱／反射對稱
afdsfsdfds
九九乘法表
龜甲
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Means
Orthocenter
Differential Calculus
Upper and Lower Sum or Riemann Sum
Right Triangles