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二次函數：一般式轉換成標準式（配方法）
Author:
user9709
GeoGebra
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正方形雪花图案
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折扣
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relations of pavlue fisher method
曲線
外心
反射(鉛垂線、水平線及斜線) Reflection (vertical line, horizontal line and line)
两角差的正切公式的证明
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Pythagoras or Pythagorean Theorem
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