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một chiếc huyền đang chạy ngược với vận tốc 25km/h so với bờ . biết vận tốc của nước là 2km/h .tính vận tốc của thuyền so với nước
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một chiếc huyền đang chạy ngược với vận tốc 25km/h so với bờ . biết vận tốc của nước là 2km/h .tính vận tốc của thuyền so với nước

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