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1、这本书可以告诉我们许多课堂上学𣎴到的小窍门

(1)可以告诉你如何确定一个数是否可以被2-13整除的简便方法。

(2)可以教你用手指算乘法。

(3)教你画出一个完美正方型和折岀完美长方型的方法。

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洋洋寒假作业--我是读书小博士

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