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cho tam giác abc có ab < ac. gọi m là trung điểm của cạnh bc. trên tia đối của tia ma lấy a điểm d sao cho md = ma. qua a kẻ đường thẳng song song với bc và cắt đường thẳng db tại e. a. chứng minh rằng aamb = admc. b. chứng minh bd // ac. c. chứng minh rằng b là trung điểm của đoạn thẳng de.
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