a)
[tex]5 \frac{1}{4} - 2 \frac{1}{6} = \frac{21}{4} - \frac{13}{6} = \frac{126}{24} - \frac{52}{24} = \frac{74}{24} = 3 \frac{2}{24} = 3 \frac{1}{12} [/tex]
b)
[tex]4 \frac{1}{3} + 2 \frac{1}{6} = \frac{13}{3} + \frac{13}{6} = \frac{26}{6} + \frac{13}{6} = \frac{39}{6} = 6 \frac{3}{6} = 6 \frac{1}{2} [/tex]
c)
[tex]4 \frac{1}{2} - 1 \frac{3}{4} = \frac{9}{2} - \frac{7}{4} = \frac{18}{4} - \frac{7}{4} = \frac{11}{4} = 2 \frac{3}{4} [/tex]
