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九點圓

Author:蔡鈞富

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異分母分數減法
畫出對稱圖形
拼砌四邊形
画直线等分三角形的面积
兩位數除以一位數（一）

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分解三棱柱
立體三角測量(例五)
Arithmetic Series 等差級數
两角差的正弦公式证明1
翰林數學_2下_CH3-1_三角形的內角與外角

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Symmetry
Median Value
Fractal Geometry
Prism
Perimeter

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