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mitxubaby
2 năm trước
Lúc 8 giờ 30 phút, một người đi xe ô tô đuổi theo một người đi xe máy, lúc đó hai xe cách nhau 30 km, đến 11 giờ hai xe gạp nhau. Tìm vận tốc mỗi xe. Biết vận tốc người đi ô tô bằng vận tốc xe máy.
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