Different denominators in the fifth volume of mathematics.

For example:

2/3x 3/7 = 2/7；

12/3 1x 1 1/ 12 = 1 1/3 1

Formula: denominator is multiplied as denominator, and numerator is multiplied as numerator. The final result can be divided into bidding points, and what cannot be divided is the final result.

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