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教学素材：抛物线与象限半区分界线
Author:
清风拂琴，陌上花开
GeoGebra
New Resources
直線的斜率：水平變化 & 鉛垂變化
中华人民共和国国旗
第八周作业3
撒针估算面积实验
三角函数 的副本
Discover Resources
劉徽的「割圓術」
Tangent to circle
周界
Angle in alt.segment
纏繞圖-五邊形
Discover Topics
Piecewise Functions
Special Points
Upper and Lower Sum or Riemann Sum
Rectangle
Integers