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bạn an đi bộ từ nhà đến trường , mỗi phút đi được 84m thì hết 15 phút . Nếu bạn an đi xe đạp từ nhà đến trường , mỗi phút đi được 180m thì hết bao nhiêu phút làm nhanh nha mik cần gấp trong hôm nay
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