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圆扇形展开（解释面积公式）
Author:
朱亮
GeoGebra
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第八周作业2
第八周作业1
三角函数 的副本
龙形曲线-分形龙2
撒针估算面积实验
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Quiz on Scientific Notation 科學記數法：測驗
空間線性組合
F2_Ch11.1_三角學(對鄰斜)
Pascal's Theorem
最佳解
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Orthocenter
Quadratic Functions
Dilation
Matrices
Tangent Line or Tangent