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2 năm trước
1 người đi bộ trên quãng đường dài 2km với vận tốc 2m/s. Quãng đường tiếp theo dài 1,8km dài 20 phút. Tính vận tốc trung bìnhcủa người đó trên cả 2 quãng đường trên. Giúp mk với!!
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