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hailongkhtn
2 năm trước
cho tam giác ABC điểm M thuộc AB , N thuộc AC. biết AM=3 cm , BM=2cm ,AN=7,5 cm ,NC= 5cm CM ;MN//BC . I là trung điểm BC , AI cắt MN tại K . CMR :K là trung điểm MN
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