3/2-1/5= 15/10 - 2/10 = 13/10
3/7x7/6= 21/42 = 1/2
1/5:3/10= 1/5 x 10/3 = 10/15 = 2/3
\(\dfrac{3}{2}-\dfrac{1}{5}=\dfrac{15}{10}-\dfrac{2}{10}=\dfrac{13}{10}\)
\(\dfrac{3}{7}.\dfrac{7}{6}=\dfrac{21}{42}=\dfrac{1}{2}\)
\(\dfrac{1}{5}:\dfrac{3}{10}=\dfrac{1}{5}.\dfrac{10}{3}=\dfrac{10}{15}=\dfrac{2}{3}\)