2/9 + 4 целых5/6- 1/18

[tex] \frac{2}{9}+4 \frac{5}{6} - \frac{1}{18} = \frac{4}{18} + \frac{29}{6} - \frac{1}{18} = \frac{4-1}{18} + \frac{87}{18}= \frac{3+87}{18} = \frac{90}{18} =5[/tex]