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河北省2016年25题
Author:
辛贺华
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
兩位數加法
平行線的斜率
兩位數除以一位數（二）
空间中两直线的位置关系
Discover Resources
空間中平面
Congruent and Similarity
intersection: surface-surface, curve-curve
三角形
Hamid Naderi Yeganeh segment4
Discover Topics
Quadratic Equations
Upper and Lower Sum or Riemann Sum
Symmetry
Difference and Slope
Linear Programming or Linear Optimization