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casienguyen2910
2 năm trước
Cho tam giác ABC vuông tại A ( AB <, AC) Trên cạnh BC lấy D sao cho BD=BA Qua D vẽ đường thẳng vuông góc với BC cắt AC tại E a) Chứng minh : AE=DE b) Biết BD= 8cm DC= 9cm Tính AC
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