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ngcaodangkhoa
2 năm trước
Cho tam giác ABC vuông tại A, có và AB = 5cm. Tia phân giác của góc B cắt AC tại D. Kẻ DE vuông góc với BC tại E. a, Chứng minh: ABD = EBD. b, Chứng minh: ABE là tam giác đều. c, Tính độ dài cạnh BC.
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