Đáp án:
k. \(\dfrac{3}{2}\)
Giải thích các bước giải:
\(\begin{array}{l}
B = \dfrac{{3233}}{{45}} - \dfrac{{1943}}{{45}} + \dfrac{{74}}{{57}}\\
= \dfrac{{1290}}{{45}} + \dfrac{{74}}{{57}}\\
= \dfrac{{86}}{3} + \dfrac{{74}}{{57}}\\
= \dfrac{{86.19 + 74}}{{57}}\\
= \dfrac{{1634 + 74}}{{57}}\\
= \dfrac{{1708}}{{57}}\\
k.\dfrac{{18.\left( {34 - 124} \right)}}{{ - 4.9.17 - 9.52}}\\
= \dfrac{{18.\left( { - 90} \right)}}{{ - 9\left( {4.17 + 52} \right)}}\\
= \dfrac{{18.90}}{{9.\left( {68 + 52} \right)}}\\
= \dfrac{{18.90}}{{9.120}}\\
= \dfrac{{18}}{{12}} = \dfrac{3}{2}
\end{array}\)
