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設有x只雞,則有12 - x只兔子. 2x + 4(12 - x)= 38 2x + 48 - 4x = 38 4x - 2x = 48 - 38 2x = 10 x = 5 雞= x = 5 兔子= 12 - x = 7 答:有5只雞,有7只兔子.
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