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2023-05-03 16:13:12
đổi 6 giờ 30 phút = 6,5 giờ
Vận tốc người đi bộ là:
780 : 6,5= 62,4 km/h
Đáp án: 62,4 km/h
2023-05-03 16:05:56
y=3
2023-05-03 16:05:44
4/3 + x/y = 5
=>x/y=11/3
=>x=11 và xy=3