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quyenak645
2 năm trước
Bài tập : Cho tam giác ABC cân tại A. Trên tia đối của tia BC và CB lấy theo thứ tự điểm D và E sao cho BD=CE. a,CM.Tam giác ADE cân b,Gọi M là trung điểm của BC. CMR:AM là tia phân giác của góc DAE và AM vuông góc với DE c,Từ B và C kẻ BH và CK theo thứ tự vuông góc với AD và AE. CMR: BH = CK d,CM: HK // BC e,Cho HB cắt CK ở N. CMR: A,M,N thẳng hàng Làm ra vở giúp mình mình đang cần gấp
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