Đáp án:
B2:
b) \(x = \dfrac{9}{4}\)
Giải thích các bước giải:
\(\begin{array}{l}
B1:\\
a)\left( {\dfrac{3}{4} - \dfrac{7}{2}} \right).\left( {\dfrac{{10}}{{11}} + \dfrac{2}{{22}}} \right)\\
= - \dfrac{{11}}{4}.1 = - \dfrac{{11}}{4}\\
b)\left( { - \dfrac{5}{{24}} + \dfrac{3}{4} + \dfrac{7}{{12}}} \right):\left( { - \dfrac{9}{4}} \right)\\
= \dfrac{9}{8}.\left( {\dfrac{{ - 4}}{9}} \right) = - \dfrac{1}{2}\\
B2:\\
a)\left( {\dfrac{7}{2} - 2x} \right).\dfrac{{10}}{3} = \dfrac{{22}}{3}\\
\to \dfrac{7}{2} - 2x = \dfrac{{11}}{5}\\
\to 2x = \dfrac{{13}}{{10}}\\
\to x = \dfrac{{13}}{{20}}\\
b)\dfrac{4}{9}x = \dfrac{9}{8} - \dfrac{1}{8}\\
\to \dfrac{4}{9}x = 1\\
\to x = \dfrac{9}{4}
\end{array}\)
