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設鴨有x只,雞有4/5x只,鹅有(x-1/4x)=3/4x只. 因為雞比鹅多280只, 所以:4/5x-280=3/4x 4/5x-3/4x=280 1/20x=280 x=280×20 x=5600 則:4/5x=4480 答:飼養場養雞4480只 樓上的計算錯誤!
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