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Tuandz_220820
2 năm trước
Cho tam giác ABC cân tại A, góc BAC bằng 100 độ. D là 1 điểm thuộc miền trong của tam giác ABC sao cho góc DBC=10 độ, góc DCB=20 độ.Tính góc ABD.Mn giúp mk vs ạ.
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