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hieu.chuyenhoa
2 năm trước
BÀI 1;cho tam giác ABC có AB=AC. Gọi M là trung điểm của BC Chứng minh rằng a, AMB=AMC B, AM là tia phân giác của góc c, AM vuông góc với BC d, vẽ At là tia phân giác của góc ngoài ở đỉnh A của chứng minh At song song với BC BÀI 2: cho tam giác ABC,=90 độ Trên BC lấy E sao cho BE=BA . Tia phân giác của góc B cắt AC ở D a, chứng minh tam giác ABD =tam giác EBD b, tính số đo c,chứng minh BD vuông góc AE
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