Fill in the number 2 10 4 15 6 20 8 () thank you
twenty-five
Odd position difference 2 increasing
The even number position difference increases by 5
RELATED INFORMATIONS
- 1. -2, - 8,4, - 20,28, - 68... Find the rules,
- 2. 1 / 3, - 2 / 15, 3 / 35, - 4 / 63
- 3. 1-3, - 2-5,3-35, - 4-63, the nth number is____________________ (find the rules)
- 4. Find the law of mathematics 1 3 5 7 15 () ()
- 5. Find the rules 1: Twenty five, (), thirty, (), forty five 2:( ),( ),( ),63,( ),( ),( ),89,( )
- 6. A question about finding laws in mathematics? When I are 1,2,3 and s are 5,3,1, what is the relationship between I and S?
- 7. 4,6,10,16,()()()
- 8. A problem of finding rules in junior high school mathematics 1,4, - 9,16,25, - 36,49,64, - 81. What is the nth number Notice that every three numbers have a minus sign,
- 9. A group of numbers in regular order: 2,0,4,0,6,0, ·, in which the seventh number is (), and the nth number is ()
- 10. According to the rule of 1, 8, 27, 64,..., the sixth number should be (); according to the rule of 2, 5, 8, 11, 14,..., the number of 83 should be () The () th in this column
- 11. Find the law 1 / 2 - (3 / 10), 5 / 26 - (7 / 50),. Find the 10th number
- 12. Please fill in the n-th number in the brackets: 1, 3, 6, 10, 15, () 10,20,40,80,() 1,-2,3,-4,5,-6()
- 13. 21 / 32,1,25 / 24,17 / 18,43 / 54, () sequence reasoning
- 14. Seeking sequence: 0,6, - 6,18, - 30,66 General term formula
- 15. The general formula of 2,6,10,14,18,22,26,30 RT
- 16. Write a general term formula of the sequence so that the first four terms are 1,4,10,22... (write the verification process)
- 17. 6, 9, 13, 18. The general formula of this sequence
- 18. For example, the general term formula of 6 10 14 18 22 26 and the general term formula of 1 49 16 25 36
- 19. The first n terms and Sn = - n Λ 2 + 9N + 2 (n belongs to n *) of sequence an are known Judge whether it is arithmetic sequence or not
- 20. Given that the arithmetic sequence {an} satisfies an + 1 = an & # 178; - Nan + 1, then an=______ .