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Cho tam giác ABC. Trên tia đối của tia AB lấy AE=AC, trên tia đối của tia AC lấy AF=AB. Nối A với trung điểm M của BC và A vs trung điểm N của EF, chứng minh: a,tam giác AB=tâm giác AFE b, tam giác ABM = tâm giác AFN
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