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111mathA
Author:
Wu Xiao-Ren
GeoGebra
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錐體建築師
異分母分數減法
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
【案例】圆柱体内放置一个大球六个小球
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題 3
複合形體的表面積(凸形)
圓心
選修數學
三角形的三线
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General Quadrilateral
Geometry
Geometric Transformations
Incircle or Inscribed Circle
Trapezoid