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vanoaht
2 năm trước
Có 3 cửa hàng bán bánh trung thu với giá bán khuyến mãi như sau: cửa hàng 1 khuyến mãi "mua 1 thành 4". Cửa hàng 2 khuyến mãi "mua 1 tặng 3". Cửa hàng 1 khuyến mãi "giảm 50% và mua 1 tặng 2". Biết rằng lúc chưa khuyến mãi giá bán của các cửa hàng là như, theo em nên chọn mua ở cửa hàng nào để có giá rẻ nhất cho cùng một loại bánh? giúp mình với
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