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lekhanh2009
2 năm trước
Cho tam giác ABC cân tại A. Vẽ AH ( BC a. Chứng minh: tam giác AHB = tam giác AHC ; b.Vẽ HM vuông góc với AB, HN vuông góc với AC. Chứng minh tam giácAMN cân c. Chứng minh MN // BC ; d.Chứng minh AH2 + BM2 = AN2 + BH2
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