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【折纸】A4纸折四面体

Author:孟宝兴

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兩組對邊相等和有直角的四邊形
近似值：有效數字
找出對稱軸
判斷球體
拼砌四邊形

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方格紙上畫梯形3
三角形的外心
S3 Trigonometry
拋物線：切線與弦中點
轨迹最值功底测第8题

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Logarithm
Vectors 3D (Three-Dimensional)
Standard Deviation
Perimeter
Confidence Interval

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