Fill in the numbers according to the rules: 2 out of 3 positive, 3 out of 4 negative, 5 out of 6 negative, (), ()

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• 1. Given a group of numbers 2, negative 5, 10, negative 17, 26, negative 37. According to this rule, what is the nth number
• 2. 17,18,13; 28, (), 19; 15,13,20; find out the rules and add the corresponding numbers in brackets
• 3. 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
• 4. 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
• 5. With a simple algorithm: (1 + 3 + 5 + 7. + 2005) - (2 + 4 + 6 + 8. + 2004) = who can answer?
• 6. (1-1 / 2005) + (1-1 / 2005 × 2) + (1-1 / 2005 × 3) +... + (1-1 / 2005 × 2004) + (1-1 / 2005 × 2005),
• 7. 41 and 1 / 3 * 3 / 4 + 51 and 1 / 4 * 4 / 5 + 61 and 1 / 5 * 5 / 6 It's good. It's closed after three minutes·····
• 8. 41 1 / 3 / 4 + 51 1 / 4 / 5 + 61 1 / 5 / 5 / 6 Please simplify the calculation, pass the equation, please
• 9. 41 and 1 / 3 × 4 / 9 + 51 and 1 / 4 × 4 / 5 + 61 and / 5 × 5 / 6 kneel down to find the formula and answer of this problem. We must use simple calculation!
• 10. Calculation: 4113 × 34 + 5114 × 45 + 6115 × 56=______ ．
• 11. 1 5 10 17 26 the law of these numbers
• 12. (1×3×11＋2×6×22＋3×9×33)/ 1×2×17＋2×4×34＋3×6×51
• 13. 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?
• 14. 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,
• 15. Find rules 5,6,1,7,8,5,3, (), ()
• 16. Find out the law 1, - 2,4, - 8,16, - 32, (), (), ()
• 17. 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
• 18. 31:1 * 3:2 + 41:1 * 4:3 + 51:1 * 5:4 + 61:1 * 6:5 + 71:1 * 7:6
• 19. Simple operation of 31:1 * 3:1 + 41:1 * 4:1 + 51:1 * 5:1
• 20. 51 and 1 / 4 * 4 / 5 + 41 and 1 / 3 * 3 / 4 + 31 and 1 / 2 * 2 / 3 2013 * 2011 / 2012 + 1 / 2012