Đáp án:
\(f)\dfrac{{27}}{4}\)
Giải thích các bước giải:
\(\begin{array}{l}
c) - \dfrac{1}{4}.\dfrac{{68}}{{11}} + \dfrac{{42}}{{11}}.\left( { - \dfrac{1}{4}} \right)\\
= - \dfrac{1}{4}.\left( {\dfrac{{68}}{{11}} + \dfrac{{42}}{{11}}} \right)\\
= - \dfrac{1}{4}.10 = - \dfrac{5}{2}\\
d)4.\left( { - \dfrac{1}{8}} \right) - 2.\dfrac{1}{4} - \dfrac{3}{2} + 1\\
= - \dfrac{1}{2} - \dfrac{1}{2} - \dfrac{3}{2} + 1 = - \dfrac{3}{2}\\
f)7 + \dfrac{5}{4} - \dfrac{3}{2} = \dfrac{{27}}{4}\\
g)\dfrac{5}{9}:\left( {\dfrac{1}{{15}} - \dfrac{2}{3}} \right) + \dfrac{5}{9}:\left( {\dfrac{1}{{11}} - \dfrac{5}{{22}}} \right)\\
= \dfrac{5}{9}:\left( {\dfrac{1}{{15}} - \dfrac{2}{3} + \dfrac{1}{{11}} - \dfrac{5}{{22}}} \right)\\
= \dfrac{5}{9}:\left( { - \dfrac{{81}}{{110}}} \right)\\
= - \dfrac{{550}}{{729}}
\end{array}\)
