N-7-3-S06_能理解無論a、b是正或負，a-b=a+(-b)。 | 合作夥伴 | 均一教育平台

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N-7-3-S06_能理解無論a、b是正或負，a-b=a+(-b)。

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N-7-3-S06_能理解無論a、b是正或負，a-b=a+(-b)。