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phuongdung14042008
2 năm trước
Cho ∆ABC có AE là phân giác. Trên tia đối của tia AC lấy điểm D sao cho AD = AB. a) Chứng minh AE // BD. b) Cho AB = 8 dm; AC = 120 cm và BC = 10 dm. Tính BE; EC.
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