逆运算

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(()(yùn )(suàn )()(yùn )(suàn ))

(zài )()()(děng )(shì )(zhōng )(yòng )(xiàng )(fǎn )(de )(yùn )(suàn )(fāng )()(cóng )()(shù )(qiú )(chū )(yuán )(shì )(zhōng )(mǒu )()()(shù )(de )(fāng )()()3×4=12,()(yòng )(chú )()(yóu )()(shù )12(qiú )(chū )(bèi )(chéng )(shù )3(huò )(chéng )(shù )4。

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