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ctvloga70
2 năm trước
hai ô tô khởi hành cùng một lúc trên quãng đường từ a đến b dài 120 km. mỗi h ô tô thứ nhất chạy nhanh hơn ô tô thứ hai là 10 km/h nên đến b trước ô tô thứ 2 là 0,4 h . tính vận tốc của mỗi ô tô
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