a) 5[tex]\frac{x}{y} \frac{1}{2}[/tex] + 3[tex]\frac{1}{2}[/tex] = 8[tex]\frac{1}{2}[/tex]
b) [tex]\frac{6}{10} + 2 \frac{4}{5}\\\frac{6+28}{10} = 3\frac{2}{5}[/tex]
c) [tex]\frac{75}{100} sau \frac{3}{4} + 1\frac{3}{4} =2 \frac{1}{2}[/tex]
