[tex]a) 5*\frac{7+19}{10} \\b) 6*\frac{7-3}{3}\\c) \frac{14-9}{9+6}*3\\d)21*\frac{\frac{1}{2} +7}{7} \\e)\frac{8}{8-9}:\frac{16-10}{12}\\f)(14*\frac{81-17}{21}):\frac{8}{3}[/tex]