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number1vinhhao@gmail.com
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giup minh bai nay voi: cho tam giac abc. goi i la mot diem thuoc mien trong cua tam giac. goi m, n, p, q lan luot la trung diem cua cac doan thang ob, oc, ac, ab
chung minh mnpq la hinh binh hanh
chung minh mnpq la hinh binh hanh
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