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honghai2001
2 năm trước
Cho tam giác ABC cân tại A ( A< 90° ). Trên cạnh AB và cạnh AC lần lượt lấy điểm D và E sao cho AD =AE. a) Chứng minh tam giác ADC = AEB b) Gọi F là giao điểm cửa BE và CD. Chứng minh tam giác FBC cân. c) Chứng minh AF là tia phân giác của góc BAC d) Gọi M là trung điểm của BC. Từ C vẽ đường thẳng song song với AB. Đường thẳng này caqts tia DM tại K. Chứng minh CK = BE
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