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maitienngoc58
2 năm trước
một chiếc xe tải đi từ A đến B với vận tốc 40 km/h. Sau 1h 30 phút, 1ch xe con cũng khởi hành từ A đến B với vận tốc 60km/h. Hai xe gặp nhau khi ch đã đi được nửa quãng đường. tính quãng đường AB.
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