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正方形折纸减去两角
Author:
孟宝兴
GeoGebra
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三位數除以一位數（一）
畫出對稱圖形
算柱 (兩位數)
異分母分數減法
画直线等分三角形的面积
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構造切線 / construct the tangent line
proof36 王宇揚
棒形圖1
变化的三角形的外心.许兴华数学
剪切成正三棱柱（制作：李三军，修订：孟宝兴）
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Root
Upper and Lower Sum or Riemann Sum
Differential Equation
Complex Numbers
Vectors