Find the rules! 1,3,8,19,42 (), ()

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1. Find the rule 2, 3, 5? 8
2. Find the rules 1,2,2,5,3,8, [], []
3. Find the rule: 4 / 3 1 8 / 9 () 4 / 5 How to fill in?
4. Find the rule: 0,1,6,7,12,13,18,19, (), ()
5. What's 18.38 N and 78.59 e
6. Detailed explanation of number reasoning 78,38,18,10,4, () 78,38,18,10,4,() Four alternative answers 2,1,4,3
7. 1999! + 1 is prime or composite
8. 1. What are the rules between them? What are the rules between them?
9. According to 1 / 2 = 1 / 5 + 3 / 10, 1 / 3 = 1 / 7 + 4 / 21, 1 / 4 = 1 / 9 + 5 / 36, how to write 1 / 9 = 1 / () + 10 / (), 1 / 8 = 1 / () + 9 / (),
10. Simple calculation (- 98) * (- 0.125) + 98 * 1 / 8 * (- 4 / 7) (- 1 / 12-1 / 36 + 3 / 4-1 / 6) * (- 36) - 19 and 24 / 25 * (- 5)
11. In the one minute rope skipping competition, the average number of Xiaohong's two jumps is 130. To make the average number of three jumps 135, how many times should she jump for the third time?
12. In a one minute rope skipping competition, the scores of 12 students are as follows: 122.119.115.110.108.105.102.100.98.97.96.88, the median is 103.5 The average is 105. Why is the average larger than the median
13. In a one minute rope skipping competition, the median score of 11 students is 52, and one student's score is 54. He () is in the top five A sure B possible C impossible
14. The results of the three students in the long jump are: a 4 and 2 / 3 meters, B 4 and 15 / 7 meters, C 4 and 12 / 11 meters. Who is the first?
15. Four students choose to apply for three items of running, high jump and long jump, one for each. There are several ways to apply
16. Four students choose to apply for running, high jump and long jump, one for each. How many ways are there to apply? Why 81?
17. There are 9 students participating in rope skipping competition and 12 students participating in long jump competition. How many students participate in both competitions at most?
18. There are 9 students participating in the rope skipping competition and 12 students participating in the long jump competition. How many students participate in both competitions
19. There are 48 students in class 6 (1), accounting for 96% of the class. How many students are there in class 6 (1)?
20. Once again, in the rope skipping competition, class 31 has 20 people participating in the collective rope skipping competition and 10 people participating in the individual rope skipping competition. Among them, 6 people have participated in both the collective rope skipping competition and the individual rope skipping competition. How many people have class 31 actually participated in the rope skipping competition