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N1 n2. N=2n2. (2n+1)(2n-1). 1/2+1/3+1/4+ +1/N формула. N-3 n0 n+2 n+4 n+5 n-3.
N=2n2. (2n+1)(2n-1). 1/2+1/3+1/4+ +1/N формула. N-3 n0 n+2 n+4 n+5 n-3.

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