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Huyenlinh
2 năm trước
Tại 2 điểm a,b cách nhau 100km .2xe ô tô chuyển động ngược chiều nhau cùng 1 thời điểm. xe ở a có vận tốc 60km/h hướng về b Xe ở b có vận tốc 40km/h Coi 2 xe chuyển động thẳng đều a,viết ptrình chuyển động 2xe b,sau bao lâu 2xe gặp nhau c,vị trí gặp nhau cách điểm a bao nhiêu km
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