http://randir-spb.livejournal.com/ ([identity profile] randir-spb.livejournal.com) wrote in [personal profile] pashap 2011-09-26 09:07 am (UTC)

Всегда ненавидел такие задачи. Непонятно, как их вообще решать.
В номере 2, наверное, должно быть (-1)^n / n, иначе ряд расходящийся.
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