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danmy112
2 năm trước
Cho tam giác ABC cân tại A. lấy điểm D thuộc canh ac, điểm E thuộc cạnh AB sao cho AD=AE. So sánh a) ABD;ACE b) Gọi I là giao điểm của BD và CE. Tam giác IBC là tam giác gì? Vì sao?
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