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caoquockien
2 năm trước
cho ΔABC ( góc A= 90 độ ), BD là phân giác của góc B (D ∈ AC), Vẽ DE ⊥ BC. Gọi F là giao điểm của AB và DE. chứng minh a) ΔABD = ΔEBD b) BD ⊥ AE c) AC = EF d) ΔADF = ΔEDC e) ΔDCF cân
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