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Mathematics, 02.08.2021 14:00 Quidlord03
1 bạn học sinh đi học từ nhà đến trường .Nửa đoạn đường đầu , bạn đi với vận tốc là 10km/h, nửa đoạn đường sau, bạn đi với vận tốc là 15km/h. Tính Vtb của bạn học sinh trên cả quãng đường?
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1 bạn học sinh đi học từ nhà đến trường .Nửa đoạn đường đầu , bạn đi với vận tốc là 10km/h, nửa đoạn...
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