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phuong2021
2 năm trước
Bài 25: (2 điểm) Một người đi xe máy từ tỉnh A và một người đi xe đạp từ tỉnh B. Hai tỉnh cách nhau 80km. Nếu họ đi gặp nhau thì mất 2 giờ. Nếu họ đi cùng chiêu thì xe máy đuổi kịp người đi xe đạp sau 4 giờ. Tính vận tốc của mỗi người. Biết răng họ cùng khởi hành một lúc. giúp mk vs nha thanks nhìu
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