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四邉形 (四年級) 教師版
三位數除以一位數（一）
兩組對邊相等的四邊形
異分母分數減法
畫出對稱圖形
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對稱方波
P53_3b
perimeter
蜘蛛網
圆周率π的收敛极快算法（代数几何方法）
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Derivative
Subtraction
Binomial Distribution
Addition
Pyramid