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減法

Author:陳冠彰

Topic:Subtraction

義守財數101級製作

New Resources

平行線的斜率
探究三角形的全等條件
空间中两直线的位置关系
祖冲之的期望：内棋与外棋
兩位數除以一位數（二）

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內切圓半徑證明
pictures
與三個半圓相切之圓的填滿
Congruent and Similarity
更相减损术几何表示

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Cosine
Plane Figures or Shapes
Exponent
Division
Rational Numbers

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