1+4+7+10+.+(3n+4)+(3N+7)=
The original formula = (1 + 3N + 7) (n + 3) / 2 = (3N & sup2; + 17N + 24) / 2
RELATED INFORMATIONS
- 1. How to calculate the number of items? 1 + 4 + 10 +. + (3N + 4) + (3N + 7) =? How many items in total?
- 2. How many terms are there in 1,4,7,10.3n + 10?
- 3. 2/1*4+2/4*7+2/7*10+2/10*13+.+2/(3n-2)(3n+1)
- 4. For any positive integer n, is the value of integral (3N + 1) (3n-1) - (3-N) (3 + n) a multiple of 10? If it is a multiple of 10, explain the reason
- 5. Why is it expressed as 3n-2 in sequence 1,4,7
- 6. If the coefficient of an unknown is 1 / 2 and the solution of the equation is 3, then the equation of the unknown can be written as
- 7. In the triangle ABC, if a = x cm, B = 2 cm and ∠ B = 45 degree sub triangle have two solutions, what is the value range of X? Please bsq20080408 give the process,
- 8. In △ ABC, a = x, B = 2, B = 45 °, if the triangle has two solutions, then the value range of X is () A. x>2B. x<2C. 2<x<22D. 2<C<23
- 9. In the triangle ABC, given B = 45 degrees, B = 2, find a value range : A is greater than 0 and less than or equal to 2 times the root sign 2
- 10. In the known triangle ABC, BC = x, AC = 2, B = 45 degrees, if the triangle has two solutions, then the value range of X is?
- 11. Given that f (x) is defined on a set of positive integers, for any n belonging to a positive integer, f (f (n)) = 3N + 2, f (2) = 1, then f (80) =?
- 12. Function f (x). For any n belonging to a positive integer, f (f (n)) = 3N, f (n + 1) > F (n), f (n) belongs to a positive integer. Find f (1) and f (12)
- 13. It is known that the function f (x) is a monotone increasing function on (0, positive infinity). When n belongs to a positive integer, f (n) belongs to a positive integer, and f (f (n)) = 3N, then f (5) =
- 14. If the function f (x) = x ^ (n ^ 2-3n) (M belongs to Z) is even and monotone decreasing on (0, + ∞), then n =,
- 15. It is known that f (x) is an increasing function defined on (0, + ∞). When n ∈ n *, f (n) ∈ n *, f [f (n)] = 3N, then f (1) + F (2)=______ .
- 16. It is known that the function f (x) is a monotone increasing function defined on (0, + ∞). When n ∈ n *, f (n) ∈ n *, if f [f (n)] = 3N, then the value of F (5) is equal to______ .
- 17. Given that y equals f (x) is an increasing function, for any n subordinate to a natural number, f [f (n)] equals 3N, find f (1) + F (6) + F (18)
- 18. Given that the domain of definition of function f (x) is x ∈ n * and f (x) is an increasing function, f (x) ∈ n *, f [f (n)] = 3N, find f (1) + F (2)
- 19. If the sum of the first n terms of an arithmetic sequence is 9 and the sum of the first 2n terms is 12, then the sum of the first 3N terms is?
- 20. If the sum of their first n terms is Sn / TN = 3N + 1 / 2N-1, then the ratio of the fifth term of these two numbers is?