\(\dfrac{3}{7}:\dfrac{1}{5}+\dfrac{6}{7}:\dfrac{1}{5}-\dfrac{2}{7}:\dfrac{1}{5}=\dfrac{3}{7}\times5+\dfrac{6}{7}\times5-\dfrac{2}{7}\times5=5\times\left(\dfrac{3}{7}+\dfrac{6}{7}-\dfrac{2}{7}\right)=5\times\dfrac{7}{7}=5\times1=5\)
3/7:1/5+6/7:1/5-2/7:1/5
= \(\left(\dfrac{3}{7}+\dfrac{6}{7}-\dfrac{2}{7}\right):\dfrac{1}{5}\)
= 1 : \(\dfrac{1}{5}\)
= 5
\(\dfrac{3}{7}:\dfrac{1}{5}+\dfrac{6}{7}:\dfrac{1}{5}-\dfrac{2}{7}:\dfrac{1}{5}\)
=\(\left(\dfrac{3}{7}+\dfrac{6}{7}-\dfrac{2}{7}\right):\dfrac{1}{5}\)
=1:\(\dfrac{1}{5}\)
=1x\(\dfrac{1}{5}\)
=\(\dfrac{1}{5}\)
