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