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Please refer to the math problems in the fifth grade of primary school.
Divide 25/12,5/12.15/7 by a fraction to get an integer, then the denominator of this maximum fraction is the least common multiple of12,7,84. Molecules are the greatest common divisor of 25,5, 15. That is, the score is 5/84. There is no minimum, because12,7 has no greatest common multiple.