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Spiral1
Author:
chen mingchuan
GeoGebra
New Resources
撒针估算面积实验
探究三角形的全等條件
龙形曲线-分形龙
盈利與虧蝕
常见四边形是否是双心四边形
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包含除法（1 ÷分數）
三角形三邊上各一點最小周長
Values of nCr & nPr 排列與組合的值
Text in Spreedsheet
简单迭代;迭代列表
Discover Topics
Upper and Lower Sum or Riemann Sum
Circumcircle or Circumscribed Circle
Logarithmic Functions
Integral Calculus
Sphere