$\frac{70,2 * 0,5}{9 * 1\frac{1}{2}} - \frac{2,4 * 10,8}{4 * 1\frac{4}{5}} - \frac{1,4 * 16,2}{3 * 1\frac{1}{5}} = \frac{\frac{702}{10} * \frac{1}{2}}{\frac{9}{1} * \frac{3}{2}} - \frac{\frac{24}{10} * \frac{108}{10}}{\frac{4}{1} * \frac{9}{5}} - \frac{\frac{14}{10} * \frac{162}{10}}{\frac{3}{1} * \frac{6}{5}} = \frac{\frac{351}{10}}{\frac{27}{2}} - \frac{\frac{6 * 108}{25}}{\frac{36}{5}} - \frac{\frac{7 * 81}{25}}{\frac{18}{5}} = \frac{351}{10} : \frac{27}{2} - \frac{6 * 108}{25} : \frac{36}{5} - \frac{7 * 81}{25} : \frac{18}{5} = \frac{351}{10} * \frac{2}{27} = \frac{6 * 108}{25} * \frac{5}{36} - \frac{7 * 81}{25} * \frac{5}{18} = \frac{13}{5} - \frac{18}{5} - \frac{63}{10} = -1 - 6,3 = -7,3$

$\frac{\frac{8}{15} * 1\frac{9}{16}}{1,5} + \frac{1\frac{1}{9} * \frac{3}{5}}{1,6} + \frac{2\frac{2}{3} * \frac{3}{16}}{1,8} = \frac{\frac{8}{15} * \frac{25}{16}}{\frac{3}{2}} + \frac{\frac{10}{9} * \frac{3}{5}}{\frac{16}{10}} + \frac{\frac{8}{3} * \frac{3}{16}}{\frac{18}{10}} = \frac{\frac{5}{3 * 2}}{\frac{3}{2}} + \frac{\frac{2}{3}}{\frac{8}{5}} + \frac{\frac{1}{2}}{\frac{9}{5}} = \frac{5}{6} : \frac{3}{2} + \frac{2}{3} : \frac{8}{5} + \frac{1}{2} : \frac{9}{5} = \frac{5}{6} * \frac{2}{3} + \frac{2}{3} * \frac{5}{8} + \frac{1}{2} * \frac{5}{9} = \frac{5}{9} + \frac{5}{12} + \frac{5}{18} = \frac{20 + 15 + 10}{36} = \frac{45}{36} = 1\frac{9}{36} = 1\frac{1}{4} = 1,25$