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肉每千克18元魚肉每千克10元 設肉每千克X元魚肉每千克Y元 得出下列方程 2X+3Y=66式一 4X+3Y=102式二 式一减去式二得出2X=36所以X=18 再將X=18代入式一的36+3Y=66所以Y=10
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