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The solution of the middle point in the first volume of mathematics textbook of the eighth grade People's Education Edition
When student A factorized a quadratic trinomial, it was decomposed into 2(x- 1)(x-9) because of misreading the coefficient of the first term, while student B factorized it into 2(x-2)(x-4) because of misreading the constant term. Try to find the original quadratic trinomial and decompose it correctly.