giai gium minh bai toan hinh nay nhe!?

Cho tam giac ABC, dung ve phia ngoai tam giac cac hinh vuong BCIJ,ACMN,ABEF va goi O,P,Q lan luot la tam cua chung

a/ Goi D la trung diem AB. CMR tam giac DOP vuong can dinh D

b/ CMR: AO vuong goc DQ, AO=PQ

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