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hyuhyu
2 năm trước
Cho tam giác abk điểm d thuộc cạnh bk gọi m là trung điểm của ad trên tia đối của tia mb lấy điểm e sao cho me=mb trên tia đối của tia mk lấy f sao cho mf=mk chứng minh: a) ae=bd b) af//bk c) ba điểm a, e, f thẳng hàng
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