a)
1. [tex]\frac{20}{5}[/tex] - [tex]\frac{12}{5}[/tex] = [tex]\frac{8}{5}[/tex]
2. [tex]\frac{16}{8}[/tex] - [tex]\frac{13}{8}[/tex] = [tex]\frac{3}{8}[/tex]
3. [tex]\frac{35}{7}[/tex] - [tex]\frac{22}{7}[/tex] = [tex]\frac{13}{7}[/tex]
b)
1. [tex]\frac{29}{9}[/tex] - [tex]\frac{11}{6}[/tex] = [tex]\frac{58}{18}[/tex] - [tex]\frac{33}{18}[/tex] = [tex]\frac{25}{18}[/tex]
2. [tex]\frac{37}{7}[/tex] - [tex]\frac{11}{4}[/tex] = [tex]\frac{148}{28}[/tex] - [tex]\frac{77}{28}[/tex] = [tex]\frac{71}{28}[/tex]
3. [tex]\frac{7}{3}[/tex] - [tex]\frac{12}{7}[/tex] = [tex]\frac{49}{21}[/tex] - [tex]\frac{36}{21}[/tex] = [tex]\frac{13}{21}[/tex]
