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Một người đi xe máy từ A đến B với vận tốc 35 km/h thì đến B chậm 2 giờ (so với dự định), nếu đi với vận tốc 50 km/h thì đến B sớm 1 giờ (so với dự định). a) Tính thời gian và vận tốc dự định để đến B đúng giờ b) Tính quãng đường AB Dừng chép trên mạng nhá, mình đọc hết r:)
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