[tex]c)\\\\ 145\frac{3}{10}- 142\frac{7}{15}=145\frac{9}{30}- 142\frac{14}{30}=144\frac{39}{30}- 142\frac{14}{30}=2\frac{25}{30}=2\frac{5}{6}[/tex]
[tex]d)\\\\ 2\frac{2}{7}*2\frac{5}{8}=\frac{\not{16}^2}{\not7}^1}*\frac{\not{21}^3}{\not{8}^1}=6[/tex]
[tex]e)\\\\ 3\frac{2}{9}:19\frac{1}{3}= \frac{29}{9}:\frac{58}{3}= \frac{\not{29}^1 }{\not{9}^3}* \frac{\not{3}^1}{\not{58}^2}= \frac{1}{6}[/tex]
