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baongochoang8401
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Giúp mik vs thanks nhìuuuuuuuuuuuuuu Cho tam giác ABC cân tại A.Gọi M,N lần lượt là trung điểm của AB,AC. a)Chứng minh rằng:BMNC là hình thang cân b)Gọi K là giao điểm của BN và CM. Chứng minh rằng AK ⊥ BC
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