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tan90

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找出對稱軸
兩位數除以一位數（二）
兩位數加法
判斷球體
兩組對邊相等的四邊形

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研習講義
利用工作表制作二分树
函數(簡易微積分)
Quiz on Mixed Arithmetic Operations of Positive Integers 正整數四則混合運算：測驗
拋物線2-焦點法
橢圓1-同心圓法

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Perimeter
Subtraction
Pythagoras or Pythagorean Theorem
Trigonometry
Binomial Distribution

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