Đáp án:
$\text{ $\dfrac{5}{8}$ x $\dfrac{7}{10}$ }$
$\text{= $\dfrac{5x7}{8x10}$ }$
$\text{= $\dfrac{35}{80}$}$
$\text{=$\dfrac{7}{16}$ }$
$\text{$\dfrac{4}{3}$ : $\dfrac{7}{11}$ }$
$\text{ = $\dfrac{4}{3}$ x $\dfrac{11}{7}$}$
$\text{= $\dfrac{4x11}{3x7}$}$
$\text{= $\dfrac{44}{21}$ }$
Giải thích các bước giải: