It is expressed by the algebraic formula containing N: 1,2,3,4,5 ；1,3,5,7,9

n;2n-1

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1. Carefully observe the arrangement rule of the sequence, and choose the correct one to make it conform to the arrangement rule of the original sequence: 4,38,18,10,4, () A：2 B：1 C：3
2. Please find the sequence 18,34,55,81 , 1 / 2 [(n-3) (5N + 12)] + 18 Please find the sequence 18,34,55,81 , 1 / 2 [(n-3) (5N + 12)] + 18. The rule of this sequence is that the difference between them is an arithmetic sequence,
3. Sequence: 4,5,6,8,9,10,12,13,14,... What are the rules?
4. Find the law, sequence 3,4,9,13
5. Finding the law of sequence 1,3,6,10,15.……………… In the same plane, when two straight lines intersect, there is a point, when three lines intersect, there are three corners, when four lines intersect, there are six How many intersections can n (n is greater than 1) lines have at most
6. Find the law of sequence: 5,5,14,38,87, (), what's the next one?
7. Finding regular sequence 1 2 3 4 5 2 4 7 11 16 The top and bottom are a group (for example, 3 and 7 are a group), and find the laws and formulas, This is a topic about rectangle, that is, a stroke can be divided into two parts at most, and two strokes can be divided into four parts at most. And so on
8. Sequence 1,38,1,5,49,4,7,50,7,9,51,10,11 What's the 100th number of? Sequence 3,48,1,5,49,4,7,50,7,9,51,10,11 What's the 100th number of?
9. What is the number 2002 of sequence 3,48,1,5,49,4,7,50,7,9,51,10,11?
10. What is the remainder of the 2002 number divided by 6
11. If the values of algebraic formula 12-3 (9-y) and algebraic formula 5 (y-4) are equal, then y = 0___ ．
12. 3, 9, 18, 30, 45, 63 are expressed by the algebraic formula containing X
13. -3,6, - 9,12, - 15,18, - 21. Expressed by the algebraic formula containing n
14. 3, 9, 18, 30?
15. 1,-1,-2,3,-5,-8,13,（）,（）
16. Please fill in 3, 8, 10, 18, 17, 28, (), (), (), ()
17. Fill in the numbers according to the rules (18,17), (14,10), (10,1), (?, 5), and one more question (1,3) (5,9) (7,13) (9,?)
18. First 23 * (- 5) - (- 3) / 123 score 8 second - 7 * (- 3) * (- 0.5) + (- 12) * (- 2.6)
19. 1×12÷323÷1×4×2×2×0= 2×3×4×5×6×7×8×9×123÷6=
20. 11 / 12 + 3 / 7 1 + 3 / 12 1 + (5 / 7 6-0.123)