Tính 3/2:(- 3/22) + 7/4( - 3/14)

8/15

Tính \(\frac{3}{2}:\left( { - \frac{3}{{22}}} \right) + \frac{7}{4} \cdot \left( { - \frac{3}{{14}}} \right)\)

\(\frac{{91}}{8}\);

\( - \frac{{91}}{8}\);

\(\frac{{111}}{{56}}\);

\(\frac{{ - 111}}{{56}}\).

Giải thích

Đáp án đúng là: B

\(\frac{3}{2}:\left( { - \frac{3}{{22}}} \right) + \frac{7}{4} \cdot \left( { - \frac{3}{{14}}} \right)\)

\( = \frac{3}{2} \cdot \left( { - \frac{{22}}{3}} \right) + \left( { - \frac{3}{8}} \right)\)

\( = \left( { - 11} \right) + \left( { - \frac{3}{8}} \right) = - \frac{{91}}{8}\)