Đáp án đúng: B
Giải chi tiết:\(\begin{array}{l}\,\,\,\,\,\,\frac{{14}}{{15}} - \left( {x - \frac{7}{{12}}} \right) = \frac{{31}}{{25}} - \left( {\frac{4}{{25}} - \frac{{4}}{{15}}} \right)\\\,\,\,\,\,\,\frac{{14}}{{15}} - \left( {x - \frac{7}{{12}}} \right) = \frac{{31}}{{25}} - \frac{4}{{25}} + \frac{4}{{15}}\\\,\,\,\,\,\,\frac{{14}}{{15}} - \left( {x - \frac{7}{{12}}} \right) = \frac{{27}}{{25}} + \frac{4}{{15}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x - \frac{7}{{12}} = \frac{{14}}{{15}} - \frac{4}{{15}} - \frac{{27}}{{25}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x - \frac{7}{{12}}\, = \frac{2}{3} - \frac{{27}}{{25}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x - \frac{7}{{12}} = \frac{{ - 31}}{{75}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{ - 31}}{{75}} + \frac{7}{{12}}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{17}}{{100}}\end{array}\)
Chọn B
