http://c-mouse.livejournal.com/ ([identity profile] c-mouse.livejournal.com) wrote in [personal profile] alex_aka_jj 2014-07-14 01:03 am (UTC)

Re: От "зануды" ;-)

Касательные к линиям в точке пересечения перпендикулярны? Не?
(45 comments)

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