What's the rule? 1, 2, 5, 9, 17, 33 What's the rule? 1, 2, 5, 9, 17, 23.

2^n+1

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1. 1 / 3 3 / 5 7 / 9... 15 / 17. According to this rule, what is the nth number I just forced junior high school students
2. 3,5,9（）,33
3. 3. What do you fill in brackets 5, 9, (), 33 and 65? What is the rule?
4. 1.2.3.5.8.13.21 find the number of the nth number, and use the algebraic expression containing n
5. 1,5,9,13,17,21 Expressed in algebraic form Before 16:40 today. Hurry up
6. The nth number of 1,5,9,13,17 is expressed by algebraic formula
7. In the algebraic formula: - 2x, Wu Fen a, B Fen a ten 1, 3 fen 1 (x ten y), n Fen 2 (m-2), 5 fen a ten B, there are () A.3 b.4 C.5 d.6 integers
8. 1.3.7.13.21.31 find the rule and express it with algebraic formula
9. There is a column of numbers 1 / 2, 4 / 17. Then the eighth number is -------
10. 4.2/4 and four fifths * 1.3 * 3.125 and six fifths / 2 and two fifths / eight fifths 3 * 29 and 27 / 26 + 2009 * [1 / 11 + 1 / 1998] - 1998 * [1 / 11 minus 1 / 2009] - 11 * [1 / 1998-1 / 2009]
11. There is a column of numbers: 1 / 2.. - 2 / 5.. 3 / 10.. - 4 / 17.. then the seventh number is
12. There is a column of numbers, one: 9, two: 10, three: 12, four: 17, five: 27, six: 44, seven: 70, eight; 107, nine: 157, to find the tenth number
13. There is a column of numbers 1, 5, 9, 13, 17. What is the number 1000 in this column? What is the number 157 in this column?
14. There is a column of numbers: - 1 / 2,2 / 5, - 3 / 10,4 / 17. What is the seventh number
15. On the number axis, the number corresponding to point a is negative, and the number corresponding to point B is positive 17. Measure the distance between two points a and B
16. Number of columns 13.1, 15.1, 17.1, 19.1 387.1, the average of this column is ()
17. There is a question, when a = 19 / 17, B = -0.198 Find the fourth power of the algebraic formula 41a - the third power of 7a, the second power of B - the second power of 5A, the fourth power of B - the fourth power of 29a + the second power of 4A, the second power of B + the third power of 5A, the second power of B - the fourth power of 12a + the second power of B, the second power of a + the second power of 2B, the third power of A. Wang Meng points out that the condition a = 19 / 17 (17 / 19), B = -0.198 given in the title is redundant. Do you think his statement is reasonable, why? 2. It is known that the quadratic power of p-pq = 1 and the quadratic power of pq-3q = 2 Finding the quadratic power of P + 3pq-3q The first question is more troublesome, please take paper to help me calculate
18. There is a column of numbers 7, O, 2,5,3,7,0,2,5,3. What is the 19th number and the 28th number
19. What are the rules of 1,2,5,10,17,26 1, 2, 5, 10, 17, 26. What's the rule
20. There is a group of numbers: 1, 2, 5, 10, 17, 26,..., please observe the law of the composition of this group of numbers, and use the law you found to determine the eighth number as____ The nth number is ()