Sequence: 4,5,6,8,9,10,12,13,14,... What are the rules?

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• 1. Find the law, sequence 3,4,9,13
• 2. 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
• 3. Find the law of sequence: 5,5,14,38,87, (), what's the next one?
• 4. 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
• 5. 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?
• 6. What is the number 2002 of sequence 3,48,1,5,49,4,7,50,7,9,51,10,11?
• 7. What is the remainder of the 2002 number divided by 6
• 8. 1 / 1,2 / 1,1 / 2,3 / 1,2 / 2,1 / 3,4 / 1,3 / 2,2 / 3,1 / 4,..., according to the law, what is the 2010 term of this sequence Known sequence: 1 / 1,2 / 1,1 / 2,3 / 1,2 / 2,1 / 3,4 / 1,3 / 2,2 / 3,1 / 4,..., according to the law of its first ten terms, how much is the 2010 term of this sequence? It's better to have the process of solving the problem and the idea
• 9. 1 / 2, 1 / 3, 1 / 6, 1 / 2, 1 / 3, 1 / 6?
• 10. According to the scale of 1:1000, the rectangle is 8cm in length and 5cm in width. If one tree is planted every 10m on the four sides of the fast ground, how many trees can be planted? Find the actual area first
• 11. 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,
• 12. 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
• 13. It is expressed by the algebraic formula containing N: 1,2,3,4,5 ；1,3,5,7,9
• 14. If the values of algebraic formula 12-3 (9-y) and algebraic formula 5 (y-4) are equal, then y = 0___ ．
• 15. 3, 9, 18, 30, 45, 63 are expressed by the algebraic formula containing X
• 16. -3,6, - 9,12, - 15,18, - 21. Expressed by the algebraic formula containing n
• 17. 3, 9, 18, 30?
• 18. 1,-1,-2,3,-5,-8,13,（ ）,（ ）
• 19. Please fill in 3, 8, 10, 18, 17, 28, (), (), (), ()
• 20. 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,?)