Giải thích các bước giải:
$\dfrac{2}{5}+\dfrac{3}{5}:(\dfrac{-3}{2})+\sqrt{\dfrac{25}{49}}$
$=\dfrac{2}{5}+\dfrac{3}{5}.\dfrac{2}{-3}+\sqrt{\dfrac{5^2}{7^2}}$
$=\dfrac{2}{5}+\dfrac{-2}{5}+\dfrac{5}{7}$
$=\dfrac{5}{7}$
$=1-\dfrac{2}{7}$
$=(-2013)^0-|\dfrac{-2}{7}|