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hangdaiycl
2 năm trước
Bài 2(4 điểm): Cho tam giác ABC vuông tại A có AB 3cm, M là trung điểm AC. Gọi AE và CF là các đường vuông góc kẻ từ A đến đường thẳng BM. Chứng minh: a. ME=MF. b. BE + BF > 6 cm
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