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Orthocentre

Author:Big Lee

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兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
找出對稱軸
拼砌四邊形
兩位數除以一位數（二）

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圓外冪問題
可調包絡圓
三角形與六邊形的結合
三角函数
S3 Ch4.3 即時測試4.3 三視圖(3D圖)

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Tangent Line or Tangent
Exponential Functions
Arithmetic
Random Experiments
Percentages

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