一道平面几何

hbghlyj · 2020-1-19 22:53

Last edited by hbghlyj 2020-1-22 01:11设O为正$\triangle$ABC的中心.D,E,F为CA,AB,BC延长线上的点.设G为$\triangle$DEF重心,H为OG中点,P为$\triangle$ADE外心,取PB中点I.求证:IH//BF.
QQ图片20200122004328.jpg

hbghlyj · 2020-1-19 22:54

Last edited by hbghlyj 2020-1-22 02:19 QQ图片20200122021356.jpg

hbghlyj · 2020-1-19 23:42

Last edited by hbghlyj 2020-1-22 02:24 QQ图片20200120222055.jpg

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[几何] 一道平面几何