5/5-1/5
=4/5
272/34+1/34
=273/33
2/5+1/4
=8/20+5/20=13/20
\(\dfrac{1}{1}-\dfrac{1}{5}=\dfrac{5}{5}-\dfrac{1}{5}=\dfrac{4}{5}\)
\(\dfrac{8}{1}+\dfrac{1}{34}=\dfrac{272}{34}+\dfrac{1}{34}=\dfrac{273}{34}\)
\(\dfrac{2}{5}+\dfrac{1}{4}=\dfrac{8}{20}+\dfrac{5}{20}=\dfrac{13}{20}\)