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angles sum of a triangle 2
Author:
LAM YU SANG
GeoGebra
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兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
異分母分數減法
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
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畫三角形 題3d
判斷柱體10
教學－棱柱摺紙樣式
绘你妈本
圖I
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Plane Figures or Shapes
Square
Binomial Distribution
Fractal Geometry
Hypergeometric Distribution