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marți, 28 decembrie 2021

aops, https://artofproblemsolving.com/community/c6t48f6h2745721_ab__mnmn_if_ac__m_ad__n_in_regular_heptagon_abcdefg


 

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Mi Prepa, https://www.facebook.com/photo?fbid=1427344626075511&set=a.575642501245732

  Mi Prepa, https://www.facebook.com/photo?fbid=1427344626075511&set=a.575642501245732 In the interior of triangle ABC having ...