According to the rules of the preceding numbers, fill in the appropriate numbers 4 / 9, 9 / 2, 1 / 9, (), 1 / 36 (), () 3 / 4, 1 / 2, 1 / 3 () 4 / 27 ()

1/18,1/72
After that: 2 / 9, 8 / 81

RELATED INFORMATIONS

1. Fill in the brackets according to the rule. (1) 1,3,9,27, (), () (2) 1,2,6,24,12 Fill in the brackets according to the rule （1）1,3,9,27,（）,（）. （2）1,2,6,24,120,（）,5040.
2. Fill in the blanks 0,5,8,17,24,37,48,65, (), ()
3. How to fill in after 65 37 17 () is a question of testing IQ I can't find the rules. I hope GG mm can help me find them,
4. What's after 65, 37, 17, () Please explain the algorithm!
5. 65 37 17 （）
6. What's the next number in 65, 37, 17, () ok
7. 65, 37, 17 what's the next number
8. 65 37 17 the next number should be
9. 2,5,10,17,26,37,50,65…… What number is 2501 Write down the rules, too
10. 65.37.17 what is the law
11. 125 times 125 out of 126 minus 124 Simple calculation!
12. Training questions: two numbers minus, the difference is 126, the subtracted increased by 125, the subtracted decreased by 60, how much difference?
13. In a subtraction formula, the sum of the subtracted, the subtracted and the difference is 19.8. If the difference is 2.75, the subtracted is 19.8______ The subtracted is______ ．
14. In a subtraction formula, the sum of the subtracted, the subtracted and the difference is 1800, and the difference is 19 times that of the subtracted. What is the difference?
15. In a subtraction formula, the sum of the subtracted, the subtracted and the difference is 19.8. If the difference is 2.75, the subtracted is 19.8______ The subtracted is______ ．
16. In a subtraction formula, the sum of the subtracted, the subtracted and the difference is 19.8. If the difference is 2.75, the subtracted is 19.8______ The subtracted is______ ．
17. In a subtraction formula, the sum of the subtracted, the subtracted and the difference is 19.8. If the difference is 2.75, how much is the subtracted and how much is the subtracted? Yes
18. In a subtraction formula, the sum of the subtracted, the subtracted and the difference is 120, and the difference is three times of the subtracted. So what is the subtraction?
19. In a subtraction formula, the sum of the subtracted, subtracted and difference is 120. What is the difference
20. If the greatest common factor of a and 18 is a, then their least common multiple is ()?