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phungem57
2 năm trước
Một ô tô dự định đi từ A đến B với vận tốc 45km/h .Sau khi đi được 3/8 quãng đường với vận tốc đó, vì đường khó đi nên người lái xe phải giảm vận tốc còn 40km/h trên quãng đường còn lại. Do đó ô tô đến chậm 50 phút so với dự định. Tính quãng đường AB. GIÚP MIK VỚI
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