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nguyenhuuminhdangala04082011
2 năm trước
Cho ∆ABC có AB = 6cm, AC = 9cm, BC = 12 cm, MAB, NAC sao cho AM = 3cm, AN= 2cm. a) Chứng minh ∆ABC~ ∆ANM b) Tính MN, biết BC = 12cm
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