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Find the rule: 4 / 3 1 8 / 9 () 4 / 5 How to fill in?
Answer: 5 / 6
Analysis:
The original title should be: 4 / 3 6 / 6 8 / 9 10 / 12 12 / 15
The numeral on the numerator increases by a multiple of 2, and the numeral on the denominator increases by a multiple of 3. The second numeral can be divided into 1, and the last fraction can be divided into 4 / 5
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