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ngoc1122
2 năm trước
Một cửa hàng bán 1 tấm vải trong 3 lần, lần thứ nhất cửa hàng bán $\frac{1}{3}$ tấm vải, lần thứ 2 bán $\frac{3}{7}$ tấm vải còn lại là 3m, lần thứ 3 bán 17m vải nữa thì hết tấm vải. Hỏi tấm vải dài mấy m.
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