Đáp án đúng: D
Giải chi tiết: Tính:\(\,0,2 \times 50 - \frac{2}{7}:\frac{1}{{14}}.\)
Ta có:
\(\begin{array}{l}0,2 \times 50 - \frac{2}{7}:\frac{1}{{14}} = \frac{1}{5} \times 50 - \frac{2}{7} \times \frac{{14}}{1}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \,\,\,\,\,\,10 - 4\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \,\,\,\,\,\,6\end{array}\)
Chọn D
