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congtruong61
2 năm trước
cho hcn abcd.goi h la chan duong vuong goc ke tu b den ac.goi m,n lan luot la trung diem cua bh va ch.biet:bc=5cm. a.tính mn b.goi I la trung diem cua AD.CM:AMIN la hinh binh hanh. c:CM:BH vuong goc IN.
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