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How to divide the numerator after dividing the denominator of the mathematical score?
The numerator is not a general division, but the numerator and denominator are multiplied by a number at the same time to keep the value of the fraction unchanged. For example, 1/2 and 1/3 are common divisors, and the least common multiple of 2 and 3 is 6. The numerator and denominator of 1/2 are multiplied by 3 at the same time to become 3/6, and the numerator and denominator of 1/3 are multiplied by 2 at the same time to become 2/6, 2/6, 3.