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项剑文
GeoGebra
New Resources
画直线等分三角形的面积
第八周作业
探究三角形的全等條件
祖冲之的期望:内棋与外棋
球体的体积推导(优化版)
Discover Resources
中點軌跡(動點在兩圓上)
扇形面積
Archimedean spiral
周界-平移法(練習二)
三角形
Discover Topics
Rational Numbers
Histogram
Expected Value
Poisson Distribution
Equilateral Triangles