求下列数学题目的答案!尽快啊!谢谢!10.用甲乙两种饮料按照x:y(重量比)混合配制成一种新饮料,原来两种饮料成本是:甲每500 克5元,乙每500克4元.现甲成本上升10%,乙下降10%,而新饮料成本恰

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