$\textit{Đáp án + Giải thích các bước giải:}$
$\text{$\dfrac{6}{7}$ x $\dfrac{5}{3}$ : $\dfrac{2}{7}$}$
$\text{= $\dfrac{6}{7}$ x $\dfrac{5}{3}$ x $\dfrac{7}{2}$}$
$\text{= 5}$
$\text{$\dfrac{60}{7}$ : $\dfrac{12}{11}$ x 2}$
$\text{= $\dfrac{60}{7}$ x $\dfrac{11}{12}$ x 2}$
$\text{= $\dfrac{110}{7}$}$
$\text{4 : $\dfrac{5}{8}$ x $\dfrac{3}{16}$}$
$\text{= 4 x $\dfrac{8}{5}$ x $\dfrac{3}{16}$}$
$\text{$\dfrac{6}{5}$}$
$\text{$\dfrac{15}{13}$ : $\dfrac{25}{26}$ : 3}$
$\text{= $\dfrac{15}{13}$ x $\dfrac{26}{25}$ x $\dfrac{1}{3}$}$
$\text{= $\dfrac{2}{5}$}$
