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vietanhluyen12
2 năm trước
1/ Cho tam giác ABC có ab=2, ac=3, đường phân giác ad=1,2. Tính góc bac. 2/ cho hình bình hành ABCD. Đường phân giác góc A cắt BD tại E, đường phân giác góc B cắt AC tại F. C/m: EF//AB
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