Find rules 5,6,1,7,8,5,3, (), ()

8.1 have you ever played bullfighting? The number of digits added by the first two numbers

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1. Eighty one Gongge (Sudoku) 81 Gongge (Sudoku) There are 81 squares, divided into nine blocks, each with 1-9 There are 9 numbers and can't be repeated. The vertical and horizontal numbers in 81 grids are 1-9 respectively Nine numbers cannot be repeated The question is as follows. Who can tell me the answer,
2. For an amusement park, 7 children and 2 adults cost 51 yuan, while 20 children and 3 adults cost 114 yuan For the tickets of an amusement park, 7 children and 2 adults need 51 yuan; 20 children and 3 adults need 114 yuan. But if more than 10 children buy tickets together, the children's tickets will be 10% off. How much are the tickets for adults and children before the discount?
3. (1×3×11＋2×6×22＋3×9×33)/ 1×2×17＋2×4×34＋3×6×51
4. 1 5 10 17 26 the law of these numbers
5. Fill in the numbers according to the rules: 2 out of 3 positive, 3 out of 4 negative, 5 out of 6 negative, (), ()
6. Given a group of numbers 2, negative 5, 10, negative 17, 26, negative 37. According to this rule, what is the nth number
7. 17,18,13; 28, (), 19; 15,13,20; find out the rules and add the corresponding numbers in brackets
8. What are the multiples of 2 in 12, 30, 8, 11, 25, 51 and 16? What are the multiples of 3? What are the multiples of 5? () is not only a multiple of 2, but also a multiple of 3. () is not only a multiple of 3, but also a multiple of 5. () is a common multiple of 2,3,5
9. The first number is 3, the second number is 10, the third number is 25, and the fourth number is 51. What is the law of this group of numbers Eager to know the answer
10. With a simple algorithm: (1 + 3 + 5 + 7. + 2005) - (2 + 4 + 6 + 8. + 2004) = who can answer?
11. Find out the law 1, - 2,4, - 8,16, - 32, (), (), ()
12. 31:1 × 3:2 + 41:1 × 4:3 + 51:1 × 5:4 + 61:1 × 6 7 × 8 of 9 and 8 + 6 × 7 of 8 and 7 + 5 × 6 of 7 and 6 + 4 × 5 of 6 and 5
13. 31:1 * 3:2 + 41:1 * 4:3 + 51:1 * 5:4 + 61:1 * 6:5 + 71:1 * 7:6
14. Simple operation of 31:1 * 3:1 + 41:1 * 4:1 + 51:1 * 5:1
15. 51 and 1 / 4 * 4 / 5 + 41 and 1 / 3 * 3 / 4 + 31 and 1 / 2 * 2 / 3 2013 * 2011 / 2012 + 1 / 2012
16. (1/11+1/20+1/31+1/40）*（1/21+1/30+1/41+1/50)-(1/11+1/21+1/31+1/41+1/51）*（1/21+1/31+1/41)=?
17. (111+121+131+141)×(121+131+141+151)−(111+121+131+141+151)× (121+131+141)．
18. (1 / 21 + 1 / 31 + 1 / 41) * (1 / 31 + 1 / 41 + 1 / 51) - (1 / 21 + 1 / 31 + 1 / 41 + 1 / 51) * (1 / 31 + 41) 1 / 2)
19. Find the rules and fill in the numbers ① 1, 1, 2, 3, 5, 8______ ②0.625，1.25，2.5，5，______ ．
20. Derivation of sequence problem Sn = 1 / A1A2 + 1 / a2a3 +. + 1 / Anan + 1 for Sn