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trigo ratios np2c

Author:np2cmath

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拼砌四邊形
近似值：有效數字
判斷球體
Fibonacci Clock
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生活中的平面圖形─四邊形的性質
生活中的平面圖形關係─全等
gjzbh 矩陣與遞迴關係（3階）
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