When and which method should be used?
When the general term formula of a sequence is the general term formula that the general term of an arithmetic sequence is multiplied by the general term formula of an equal ratio, the dislocation formula is used
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- 1. Senior three a round of sequence sequence sum dislocation subtraction homework master into ah It is known that the tolerance D of the arithmetic sequence an is greater than 0, and A2 and A5 are two of the equations x ^ 2-12x + 27 = 0. The sum of the first n terms of the sequence BN is TN, and TN = 1-1 / 2bn (1) Finding {an} {BN} will find that an = 2N-1, BN = 2 / 3 * [(1 / 3) of the N-1 power] (2) Note CN = anbn, find the first n terms of {CN} and Sn Is to seek the second question of dislocation subtraction!
- 2. Easy to understand, I have a poor foundation, too abstruse to understand ~
- 3. High school mathematics sequence dislocation want to reduce
- 4. High school mathematics what kind of sequence can use superposition to find Sn, what kind of sequence can use dislocation subtraction to find Sn, it's better to be more detailed and list all the possibilities
- 5. It is urgent to find the sum of sequence dislocation subtraction The calculation problem is urgent
- 6. Using the method of dislocation subtraction to find the first n terms and the higher one sequence Given the square of. An = 4N, find the sum of the first n terms of. BN = 1 / 2-1 of an ^ 2-1
- 7. Examples of dislocation subtraction in sequence an=4n-2 bn=2/[4^(n-1)] cn=an/bn Finding the first n terms and TN of CN of sequence
- 8. How to calculate the dislocation subtraction method in the proportional sequence? I don't quite understand this algebra
- 9. What is the meaning of "equal difference multiplied by equal ratio" in dislocation subtraction method
- 10. The solution is: SN = 1 × 2 + 3 × 4 + 5 × 8 +. + (2n-1) 2 * n (this represents the nth power of 2)
- 11. Which mathematician put forward these ideas first
- 12. What is the sum of split term subtraction, dislocation subtraction, reverse order addition and reverse order addition?
- 13. If the sequence {an} satisfies Sn = 3A (n + 1) + 2, n ∈ n *, A1 = 1, then the general term formula of sequence an is? (n + 1) is the subscript When n ≥ 2, an = s (n) - S (n-1) = 3A (n + 1) + 2 - 3an-2 4An=3A(n+1) A(n+1) / An = 4/3 {an} is the common ratio q = 4 / 3 =?
- 14. If the first n terms of an and Sn = (1 / 3) ^ Na + 1 / 6, a=
- 15. Let the sum of the first n terms of the sequence an be Sn, A1 = 1, an = (Sn / N) + 2 (n-1) (n ∈ n *) and prove that the sequence an is an arithmetic sequence, Let the sum of the first n terms of a sequence an be Sn, A1 = 1, an = (Sn / N) + 2 (n-1) (n ∈ n *) 1. Prove: the sequence an is the arithmetic sequence, and write the expressions of an and Sn about n respectively 2. Is there a natural number n such that S1 + S2 / 2 + S3 / 3 + +Sn / N - (n-1) ^ 2 = 2013, if it exists, calculate the value of N, if it does not exist, please explain the reason
- 16. Given the first n terms of sequence {an} and Sn = n ^ 2 + N + 1, is an arithmetic sequence?
- 17. Let the sum of the first n terms of a sequence an be Sn, the N + 1st power of A1 = 1 Na = (n + 2) Sn (n belongs to n-positive) prove that the sequence Sn / N is an equal ratio sequence and find Sn if the sequence Let the sum of the first n terms of the sequence an be SN. Given that A1 = 1, the nth + 1st power of Na = (n + 2) Sn (n belongs to n positive), prove that the sequence Sn / N is an equal ratio sequence and find SN. If the sum of the first n terms of the sequence SN is TN, find TN should be explained in detail
- 18. In the sequence {an}, if an = n (sin n π / 2 + cos n π / 2), the sum of the first n terms is Sn, then S100 =?
- 19. If the sum of the first n terms of the sequence an is Sn, then Sn =?
- 20. If the sum of the first n terms of the sequence an is Sn, then S30 =?