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proof 49 黃彥淇
Author:
郭亮偉
GeoGebra
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【案例】2013年安徽高考15题
球体的体积推导（优化版）
第八周作业
兩位數除以一位數（二）
球体的体积推导
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Quartiles and Box Plot (two data sets) 四分位數與框線圖（比較兩組數據）
圓與兩平行切線
箭头平移动画
congruent triangle_provided by Mr Yeung Kar Chun
正方体的三视图
Discover Topics
Centroid or Barycenter
LCM and GCD
Secant Line or Secant
Geometry
Complex Numbers