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設雞鴨鹅的總數為x只. 則雞的只數為1/2x 鴨的只數為1/3x 鹅的只數為x-1/2x-1/3x 所以,雞:鴨:鹅=1/2x:1/3x:(x-1/2x-1/3x) =1/2:1/3:1/6 =3:2:1 答:雞鴨鹅的只數比為3:2:1.
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