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Mathematics, 20.06.2021 21:40 21hendlill
Người a mỗi giờ đi được 1/5 quãng đường , người b mỗi giờ đi dược 1/7 quãng đường . Hỏi nếu 2 người xuất phát cùng lúc đi ngược chiều nhau thì sau bao lâu sẽ gặp nhau
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Người a mỗi giờ đi được 1/5 quãng đường , người b mỗi giờ đi dược 1/7 quãng đường . Hỏi nếu 2 người...
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