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A school plans to buy a number of computers. Now we know from two shopping malls that the price of each computer of the same model is 6000 yuan, and there is a certain discount for buying more computers. The preferential conditions of shopping mall a are: the first computer is charged at the original price, and the rest is 25% discount; the preferential conditions of shopping mall B are: 20% discount for each computer. (1) write down the difference between the charges of two shopping malls and the number of computers bought What's the relationship? (2) What's the better way to buy in a shopping mall? (3) What's more favorable to buy at B mall? (4) Under what circumstances are the charges of the two shopping malls the same?
(1) According to the meaning of the question: a mall charges Y1 = 6000 + (1-25%) × 6000 (x-1), that is, Y1 = 4500X + 1500, B mall charges y2 = (1-20%) × 6000x, that is, y2 = 4800 x, (2) when Y1 < Y2, that is, 4500X + 1500 < 4800 x, the solution is: x > 5
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