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lethihien2019
2 năm trước
cho tam giác ABC cân tại A nội tiếp đường tròn tâm O . D là một điểm tùy ý trên cạnh BC . Tia AD cắt đt(o) ở E . Chứng minh : a,Góc AEC=ACB b, tam giác AEC đồng dạng với tam giác ACD
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