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minhhieuhd1905206
2 năm trước
Tam giác ABC, AM phân giác BAC (M thuộc BC). Trên nửa mặt phẳng bờ BC không chứa A. Kẻ tia Cx sao cho BCx bằng 1/2 BAC . Cx giao AM tại N. a)BM.MC=MN.MA b)Tam giác ABM ~ Tam giác ANC
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