Thực hiện phép tính. d) 1(2/5) : 14/15 + ( 1(1/3) − 2(1/2) : 5/6

d) $1\frac{2}{5}:\frac{14}{15}+(1\frac{1}{3}-2\frac{1}{2}):\frac{5}{6}$

$=\frac{7}{5}:\frac{14}{15}+(\frac{4}{3}-\frac{5}{2}):\frac{5}{6}$

$=\frac{7}{5}.\frac{15}{14}+\left(\frac{-7}{6}\right).\frac{6}{5}$

$=\frac{3}{2}+\left(\frac{-7}{5}\right)=\frac{1}{10}$