Đáp án đúng: B
Giải chi tiết:Ta có:
\(\begin{array}{l}\left( {x \times 10} \right):3 = \left( {3372 \times 5} \right):3\\\left( {x \times 10} \right):3 = \left( {3372:3} \right) \times 5\\\left( {x \times 10} \right):3 = 1124 \times 5\\\left( {x \times 10} \right):3 = 5620\\x \times 10\,\,\,\,\,\,\,\,\,\, = \,5620 \times 3\\x \times 10\,\,\,\,\,\,\,\,\,\,\, = \,\,16\,860\\x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \,16860:10\\x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 1686\end{array}\)
Đáp số: \(x = 1686\).
Chọn B.