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phuonghoalechan
2 năm trước
Bài 1. Cho tam giác ABC, điểm M thuộc đoạn AB, điểm N thuộc đoạn AC. Biết AM = 3cm, BM = 2cm, AN = 7,5cm, NC = 5cm. a) CMR: MN//BC. b) Gọi I là trung điểm của BC, AI cắt MN tại K. CMR: K là trung điểm của MN
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