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lethihongmoilhd
2 năm trước
1. lúc 7 giờ 30 phút một ô tô đi từ A với vận tốc 40km/giờ và đến B lúc 9 giờ 15 phút. Lúc 8 Một xe máy đi từ B đến A với vận tốc 35km/giờ .A, tính thời gian ô tô đi từ A đếnB B, tính quãng đường AB. C, xe máy và ô tô gặp nhau lúc mấy giờ
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