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相似图形

Author:谭伟

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找出對稱軸
算柱 (兩位數)
兩組對邊相等的四邊形
異分母分數減法
四邊形的特性

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task6
第三冊
不是平行四邊形的四邊形
圖形的周界
線性變換矩陣（二階）的副本

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Special Points
Algebra
Pythagoras or Pythagorean Theorem
Means
Conditional Probability

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