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ngoyenquynh3
2 năm trước
cho tam giác ABC có AB < AC phân giác AD trên cạnh AC lấy điểm E sao cho AE=AB , c/m : a, ABD=AED B, trên tia đối tia BA lấy điểm F sao cho BF=EC , C/m : tam giác BDF= tam giác EDC E,D,C THANGE HÀNG C , AD là đường trung trực của BE BE//FC nhớ vẽ hình giúp mk nha
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