Đáp án:
d) 4
Giải thích các bước giải:
\(\begin{array}{l}
a)\left( { - \dfrac{2}{3} + \dfrac{3}{7} - \dfrac{1}{3} + \dfrac{4}{7}} \right):\dfrac{4}{5}\\
= \left( { - 1 + 1} \right):\dfrac{4}{5} = 0\\
c)\dfrac{1}{3}.\left( { - \dfrac{{13}}{5}} \right) - \dfrac{2}{5}.\dfrac{{16}}{3}\\
= \dfrac{{ - 13 - 32}}{{15}} = - 3\\
f)8 + 3.1 - \dfrac{1}{4}.4 + 4.2.8\\
= 74\\
b) - \dfrac{1}{2}.\dfrac{{16}}{9} - \dfrac{2}{3}.\dfrac{8}{9}\\
= - \dfrac{8}{9} - \dfrac{{16}}{{27}} = - \dfrac{{40}}{{27}}\\
d)1.2 - 6 + 8 = 4
\end{array}\)
