[tex] \frac{39}{16} \div ( - \frac{13}{8} ) = \\ = \frac{39}{16} \times ( - \frac{8}{13} ) = \\ = - \frac{39 \div 13}{16 \div 8} = \\ = - \frac{3}{2} \\ \\ \\ - \frac{100}{13} \div ( - \frac{50}{26} ) = \\ = - \frac{100}{13} \times ( - \frac{26}{50} ) = \\ = \frac{2}{1} \times \frac{2}{1} = 4 \\ \\ \\ \frac{21}{20} \div 14 = \\ = \frac{21}{20} \times \frac{1}{14} = \\ = \frac{3}{20} \times \frac{1}{2} = \\ = \frac{3}{40} \\ \\ \\ = \frac{30}{82} \div \frac{5}{41} = \\ = \frac{30}{82} \times \frac{41}{5} = \\ = \frac{6}{2} \times \frac{1}{1} = \frac{6}{2} [/tex]
