# 物理課上課時間到了！
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## 第一單元！
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### 3rd title
- point
- point
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## 牛頓
$\displaystyle F\ =\ ma$
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## 萬有引力
$\displaystyle F\ =\ G\frac{m_{1} m_{2}}{r^{2}}$
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## 單擺公式
$\displaystyle T\ =\ 2\pi \sqrt{\frac{m}{k}}$
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## 質能轉換
$\displaystyle E\ =\ mc^{2}$
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