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Một ô tô đi từ A đến B dài 100km . Lúc về vận tốc ô tô tăng thêm 10km/h. Do đó thời gian về ít hơn thời gian đi là 30 phút . Tính vận tốc lúc đi Lưu ý : lm rõ phần giải phương trình giupd mik nha Đừng có ghi chữ giải pt ta đc x= ... nha giải ra luôn ạ Cảm ơn mn nhìu .
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