Giúp mik b4 ạ:((( mik đang cần gấp Cho tam giác MNP Có MN=MP.Gọi H là trung điểm của NP.Nối M với H A.Chứng mình tam giác MNH= t.giac MPH B.chứng mình MH vuông góc với NP

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