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保持2:3:4

Author:hjyanghj

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兩位數加法
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
畫出對稱圖形
拼砌四邊形

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公切線長度的計算
直線方程
http://www.qsir.org/?p=8853
銀杏葉
拋物線5--包絡線法

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Conditional Probability
Real Numbers
Logarithmic Functions
Parabola
Scatter Plot

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