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thuthaojk
2 năm trước
Cho tma giác ABC vuông tại A có AB = 3cm, BC = 5cm a, Tính độ dài đoạn thẳng AC b, Trên tia đối của tia AB lấu điểm D sao cho AD = AB. Chứng minh tam giác ADC = tam giác ABC c, Gọi M là trung điểm của CD. Qua D vẽ đường thẳng song song với BC cắt BM tại E. Chứng minh tam giác CDE cân tại E d, Gọi I là giao điểm của AC và BE. Chứng minh BC+BD>6.IM
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