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doantrang14112001
2 năm trước
một người đi xe đạp chạy từ a đến b trong 24 giây với vận tốc 2,5m/s. trên quãng đường bc người ấy đi hết 36 giây. biết vận tốc trung bình trên cả quãng đường ac là 4m/s. tính quãng đường bc và vận tốc trên quãng đường đó?
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