Observe the number of the following column, 1.3.6.10.15.21... According to this rule, what is its number in 2004

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• 1. Observe the number in the following column, 1,3,6,10,15,21. According to this rule, its number 2004 is
• 2. Look at the numbers 1, 3, 6, 10, 15, 21, 28, 1 According to the law, what is the number from one to the hundredth? What is the number in 2009?
• 3. Please observe the law of the following numbers and fill in the appropriate numbers in brackets according to the law: 1,2,3,5,8,13,21, (), 55,89?
• 4. 1. 2; 3; 4; 5; 6; 7. N 1; 2; 3; 4; 5; 6; 7 ........n 0; 1; 3; 6; 10; 15; 21 ........( )
• 5. 1→3 2→6 3→10 4→15 5→21 … … The law of finding formula
• 6. There is a column of numbers: 1, 3, 6, 10, 15, 21... What is the nth number?
• 7. The rule of number is: 1, 3, 6, 10, 15, 21. Find the difference between the 24th number and the 22nd number
• 8. 1 3 7 15 what are the six numbers in this order? What is the tenth number
• 9. 1+3+6+10+15+…… What's the law of life
• 10. It is known that a, B and C are all nonnegative numbers and satisfy the equations 3A + 2B + C = 5 and 2A + b-3c = 1. If M = 3A + b-7c, the maximum and minimum values of M are obtained Tip: apply inequality knowledge.
• 11. Mathematical solution; write numbers according to the law; 0,1,3,5,8,21,55, (--, --, --, --,)
• 12. What are the rules of 3, 6, 10, 15 and 21?
• 13. The rule of 0 1 3 6 10 15 21 28 36 (expressed by n),,,,, you prawns are bubbling ,,,,,, n denote
• 14. Calculation: 13 + 16 + 110 + 115 + 121 + 128 + 136 + 145=______ ．
• 15. 1, 3, 6, 10, 15, 21, 28, 36, 45
• 16. What is the law of the calculation of 1 + 3 + 6 + 10 + 15 + 21 + 28?
• 17. -3 / 7,2 / 5, - 5 / 13,3 / 8, - 7 / 19,4 / 11 write the general formula
• 18. 5/7,5/13,17/63,13/63…… , find the law, find the general term formula
• 19. 1,3,6,10,15,21,…… Who can tell me the general formula? It can be described in words
• 20. The general formula of 0 1 3 6 10 15 21 28