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letrungnghia693
2 năm trước
Bài 2 :cho Δ abc có ab=ac,trên cạnh AB lấy điểm M , AC lấy N sao cho AM =AN gọi H là trung điểm b)gọi E là giao điểm của AH và NM . chứng minh ΔAME= ΔANE c)c/m MN//BC bài 3 : cho Δ ABC vuông tại A , tia phân giác của góc ABC cắt AC tại d . Lấy E trên cạnh BC sao cho BE=AB a)c/m ΔADB= ΔEBD b)Tia ED cắt BA tại M . C/M EC=AM c) nối AE . c/m góc eac=eam
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