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Letramy
2 năm trước
giải toán bằng cách lập phương trình : Một người đi xe máy từ A đến B với vận tốc trung bình 40km/h . khi quay trở về B về A người đó tăng vận tốc thêm 10km/h nên thời gian về hết ít hơn thời gian đi 30 phút . Tính qũng đưìưng AB
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