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HVNGOC
2 năm trước
Một ô tô chuyển động đều với vận tốc đã định để đi hết quãng đường 120km. Đi được nửa quãng đường ,xe nghỉ 3 phút , để đến nơi đúng giờ xe phải tăng vận tốc thêm 6km/h trên nửa quãng đường còn lại. Tính thời gian xe lăn bánh trên đường
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