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phanthithuthanh1976
2 năm trước
Câu 3: Lúc 7 h sáng tại 2 địa điểm A và B cách nhau 80 km Có 2 xe ô tô chạy cùng chiều từ A đến B với vận tốc lần lượt là vA = 70 km/h, vB = 50 km/h a) Xác định thời điểm xe đi từ A còn cách xe đi từ B 20 km. b) Xác định thời điểm 2 xe gặp nhau và vị trí 2 xe gặp nhau cách B bao nhiêu km?
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