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khanglocuong
2 năm trước
Bài 1. Hai thành phố A và B cách nhau 250km.  Lúc 7h sáng, 2 ô tô khởi hành từ hai thành phố đó hướng về nhau( ngược chiều nhau). Xe từ A có vận tốc v1 = 60km/h, xe kia có vận tốc v2 = 40 km/h. Chọn trục tọa độ là đường thẳng AB, gốc toạ độ tại A (), chiều dương từ A đến B và gốc thời gian lúc 7h. a. Hỏi 2 ô tô sẽ gặp nhau lúc mấy giờ? tại vị trí cách B bao nhiêu km? b. Xác định vị trí và thời điểm chúng cách nhau 25km
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