Sum of sequence, an = 1 / N ^ 2 Given an = 1 / N ^ 2, find SN I think out of the problem, but I can't do, the master help me see

You can't sum

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1. The third sub problem of the key point is known that in the sequence {an}, A1 = 1, Nan + 1 = 2 (a1 + A2 + a3 +... + an) (n ∈ n *) (1) the general formula for finding A2, A3, A4 (2) for finding an (3) Let {BN} satisfy B1 = 1 / 2, B (n + 1) = 1 / AK * BN ^ 2 + BN, and prove BN
2. In sequence an, A1 = 1, A3 = 7, and a (n + 1) = nan-1 / (n-1), find the general term formula of an
3. If an > 0, A1 = 1, an ^ 2 - (an-1) ^ 2 = (an-1) * an, If an > 0, A1 = 1, an ^ 2 - (an-1) ^ 2 = (an-1) * an, then 1 / (a1 + A2) + 1 / (A2 + a3) + +1/(an-1+an) =
4. Given the sequence an = 4n-2 and BN = 2 / 4 ^ (n-1), let CN = an / BN, find the first n terms and TN of the sequence {CN}
5. Note CN = an × BN to find the first n terms and TN of sequence {CN} an=2n-1 bn=2/(3^n)
6. Given the N-1 degree of sequence an = 2n + 1 bn = 8. CN = an * BN. Find the first n terms of CN and TN
7. If BN = | an | (n ∈ n), find the first n terms and TN of {BN}
8. It is known that the sum of the first n terms of the sequence {an} is Sn, A1 = 1, an + 1 = 2Sn + 1, (n belongs to n *), and BN & gt; 0 (n) in the arithmetic sequence {BN} It is known that the sum of the first n terms of the sequence {an} is Sn, A1 = 1, an + 1 = 2Sn + 1, (n belongs to n *), BN > 0 (n belongs to n *) in the arithmetic sequence {BN}, and B1 + B2 + B3 = 15, and a1 + B1, A2 + B2, A3 + B3 are equally proportional. 1) find the general term formula of the sequence {an}, {BN}, 2), find the first n terms and TN of the sequence {an · BN}
9. [sequence summation] 1 + 2x + 3x ^ 2 + +nx^n-1=()? 1+2*x+3*(x^2)+…… +n*x^(n-1)=( When x is not equal to 1, = (1-x ^ n) / [(1-x) ^ 2] - [n * (x ^ n)] / (1-x) When x equals 1, = n (n + x) / 2
10. Sequence 0 + 1 + 3 + 6 + 10 What is the summation formula?
11. Summation of an = 4 / (n + 1) (n + 3) sequence
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14. The general term formula an = 3N + 1 of sequence {an} is known. The second term, the fourth term and the eighth term are taken out in turn. The second ^ n term constitutes a new sequence {BN}, Find the general formula of {BN}
15. Statistical univariate linear regression proved that SST = SSE + SSR How to prove the unitary linear regression SST = SSE + SSR,
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20. There is a point P (x, y) in the coordinate plane. If xy = 0, then the position of point P is in the coordinate plane