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kwonyeonchan
2 năm trước
Cho tam giác ABC với AB=4cm, BC= 5 cm. Tính độ dài AC. Trên tia đối tia AB lấy điểm D sao cho AB=AD. Chứng minh tam giác ABC= tam giác ADC, từ đó suy ra tam giác BCD cân. Trên AC lấy điểm E sao cho AE = 1/3 AC. Chứng minh DE đi qua trung điểm I của BC.
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