vuongphamtrong vuongphamtrong
  • 22-02-2024
  • Advanced Placement (AP)
contestada

Có 19 người xuống tàu ở trạm đầu tiên. 17 người khác lên tàu. Giờ tổng cộng trên tàu có 63 người. Như vậy, lúc đầu trên tàu có bao nhiêu người?

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