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dolucquan1
2 năm trước
Tính góc B và góc C của tam giác ABC biết : a) Góc A = 70 độ, góc B - góc C = 10 độ b) Góc A = 60 độ , góc B=2. góc C c) Góc A=100 độ, góc B - góc C = 50 độ
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