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thuhien2451
2 năm trước
Một người vài cửa hàng đang muốn chọn một cái tủ lạnh trong hai loại,tủ lạnh loại A có giá 3trieu đồng và sử dụng trung bình khoảng 500KW điện trong 1 năm,tủ lạnh loại B có giá 4 triệu đồng và sử dụng trung bình khoảng 400KW trong 1 năm,biết rằng tủ lạnh loại A và B đều coá công năng như nhau và giá 1KW điện là 2000 đồng a) viết biểu thức biểu thị tổng số tiền cần trả( bao gồm tiền mua bán đầu và tiền điện trong X năm sử dụng cho cả hai loại tủ lạnh trên b)Thời gian sử dụng bao lâu thì nên mua tủ lạnh loại để người mua có lợi hơn P.S: em cần gấp ạ mong mn giải em vote 5 sao
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