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thinh12nam34
2 năm trước
a) Cho tam giác ABC .Tính số đo các góc A , B ,C biết số đo các góc A , B ,C tỉ lệ nghịch với 3 ; 8; 6 . b) Cho tam giác ABC có 5C = A+B. Tính số đo các góc A, B ,C biết A:B= 2:3
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