To make it clear, we didn't learn the quadratic equation. The average number of numbers 1, a, B and C is 270. A is 18 larger than B, and B is 75 smaller than C. what are the numbers a, B and C? 2. "Little careless" Wang Qun made a mistake when he added two numbers together to make a subtraction. The result is 17.2, 15.6 less than the correct answer. What are the two addends? What is the correct answer? The answer to the first question is a257, B is 239, C is 314 The two numbers are 25 and 7.8

According to the meaning of the question, we can know B = A-18C = B + 75 = A-18 + 75 = a + 57, and then we can know (a + B + C) / 3 = 270 from the average number of a, B and C, that is, a + (A-18) + (a + 57) = 810. If a = 257, then a = 257, B = 239, C = 3142

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