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Cho tam giác ABC có 2Aˆ=3Bˆ=6Cˆ . Trên nửa mặt phẳng bờ BC không chứa điểm A vẽ cung tròn tâm B có bán kính BA, vẽ cung tròn tâm C có bán kính CA, hai cung tròn này cắt nhau tại D. Khi đó số đo góc lớn nhất của tam giác BDC là:
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