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'''負數'''者，小於[[〇]]之數也。大於〇者，謂之[[正數]]。負數與〇，謂之非正數也。

一數加負數，等於減其相反數，如<math> 2 + (-2) = 2 - 2 = 0 \,</math>。

負數乘正數，得負數。負數乘負數，得正數。

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[[Category:數]]

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