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2 năm trước
giúp mình với : 2 ô tô xuất phát từ a và b cùng một lúc và đi ngược chiều nhau sau 2 giờ chúng gặp nhau quãng đường ab dài 210 km tính vận tốc mỗi ô tô biết vận tốc ô tô đi từ a lớn hơn vận tốc ô tô đi từ b là 5 km / h mình sẽ tim 5 *
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