http://pechkin.livejournal.com/ ([identity profile] pechkin.livejournal.com) wrote in [personal profile] pechkin 2016-02-21 07:24 am (UTC)

Попробую перевести это в понятные ребенку формы. Но выглядит как-то не математично.
(12 comments)

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