甲、乙两人两次同时在同一粮店购买粮食（假设两次购买粮食的单价不相同），甲每次购买粮食100kg，乙每次购粮用去100元。（1）设第一、第二次购粮单价分别为x元/kg和y元/kg，用含-八年级数学

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• 化简的结果是[]A.B.C.D.-八年级数学
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• 计算：。-八年级数学
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