If a = 3 and b = 1 are obtained from the equation, the factor 3b-a appearing in the denominator of the score will make the score meaningless when simplifying the original score, so it is meaningless to find the value of the original score when a = 3 and b = 1. Therefore, the answer to this question: the original formula = 1/3 is obviously absurd and wrong.

Please ask the "experts" in Chongqing senior high school entrance examination (because people like to be called experts nowadays) to seriously reflect on why there is such a low-level confusion in the exam, which determines the fate of hundreds of thousands of candidates.