1/
$\dfrac{6}{5}+\dfrac{1}{5}:\dfrac{2}{3}+\dfrac{1}{5}$
$=\dfrac{6}{5}+\dfrac{1×3}{5×2}+\dfrac{1}{5}$
$=\dfrac{6}{5}+\dfrac{3}{10}+\dfrac{1}{5}$
$=\dfrac{12}{10}+\dfrac{3}{10}+\dfrac{2}{10}$
$=\dfrac{12+3+2}{10}$
$=\dfrac{17}{10}$
2/
$\dfrac{5}{9}+x=\dfrac{6}{7}:\dfrac{2}{3}$
$\dfrac{5}{9}+x=\dfrac{6×3}{7×2}$
$\dfrac{5}{9}+x=\dfrac{9}{7}$
$x=\dfrac{9}{7}-\dfrac{5}{9}$
$x=\dfrac{46}{63}$
chúc bạn học tốt!
