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甲、采购员同去一家饲料公司购买两次饲料．两次饲料的价格分别为m元/千克和n元/千克（m、n都为正数，且m≠n），两名采购员的购货方式不同，其中甲每次购买800千克；乙每次用去800元，而不管购买多少饲料． （1）用含m、n的代数式表示甲、采购员两次购买饲料的平均单价各是多少？ （2）若规定：谁两次购买饲料的平均单价低，谁的购货方式合算，请你判断甲、采购员购货方式哪个更合算？说明理由．
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