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heoqunh
2 năm trước
một người đi xe đạp đi nửa quãng đường đầu v1=15km/h, đi nửa quãng đường sau với vận tốc v2 không đổi. biết các đoạn đường mà người đó đi là thẳng và vtb= 10km/h .tính v2
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