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dinhvnpd
2 năm trước
Cho ∆ABC vuông tại A có AB=3cm,AC=4cm a) Tính độ dài cạnh BC b) Trên tia đối của tia AC lấy điểm D sao cho AD=AB. ∆ABC có dạng đặc biệt nào? Vì sao? c)Lấy trên tia đối của AB điểm E sao cho AB=AE Chứng minh DE=DC
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