4.17. Вычислите:

Здесь нужно вычислить примеры с дробями. А) -\frac{2}{3} * \frac{3}{8} = -\frac{2*3}{3*8} = -\frac{6}{24} = -\frac{1}{4} Б) \frac{4}{15} * \frac{5}{8} = \frac{4*5}{15*8} = \frac{20}{120} = \frac{1}{6} В) -\frac{5}{9} * (-\frac{12}{25}) = \frac{5*12}{9*25} = \frac{60}{225} = \frac{4}{15} Г) -3\frac{1}{2} * (-\frac{4}{7}) = -\frac{7}{2} * (-\frac{4}{7}) = \frac{7*4}{2*7} = \frac{28}{14} = 2 Д) 1\frac{1}{8} * (-5\frac{1}{3}) = \frac{9}{8} * (-\frac{16}{3}) = -\frac{9*16}{8*3} = -\frac{144}{24} = -6 Е) -3\frac{3}{5} * 6\frac{1}{4} = -\frac{18}{5} * \frac{25}{4} = -\frac{18*25}{5*4} = -\frac{450}{20} = -\frac{45}{2} = -22.5 Ё) -3\frac{1}{5} * 1.2 = -\frac{16}{5} * \frac{12}{10} = -\frac{16*12}{5*10} = -\frac{192}{50} = -\frac{96}{25} = -3.84 Ж) 1.8 * (-1\frac{1}{3}) = \frac{18}{10} * (-\frac{4}{3}) = -\frac{18*4}{10*3} = -\frac{72}{30} = -\frac{12}{5} = -2.4 З) -2\frac{2}{15} * (-6.25) = -\frac{32}{15} * (-\frac{625}{100}) = \frac{32*625}{15*100} = \frac{20000}{1500} = \frac{40}{3} = 13\frac{1}{3} И) -3.6 * (-0.25) = \frac{-36}{10} * \frac{-25}{100} = \frac{36*25}{10*100} = \frac{900}{1000} = \frac{9}{10} = 0.9 Й) -\frac{1}{7} * 14.56 = -\frac{1}{7} * \frac{1456}{100} = -\frac{1456}{700} = -2.08 К) 0.75 * (-480) = \frac{75}{100} * (-480) = -\frac{75*480}{100} = -360 Л) -2\frac{4}{13} * (-2.6) = -\frac{30}{13} * (-\frac{26}{10}) = \frac{30*26}{13*10} = \frac{780}{130} = 6 М) 4.32 * (-12.5) = \frac{432}{100} * (-\frac{125}{10}) = -\frac{432*125}{100*10} = -\frac{54000}{1000} = -54 Н) (-\frac{5}{9}) * (-18.18) = \frac{5}{9} * \frac{1818}{100} = \frac{5*1818}{9*100} = \frac{9090}{900} = 10.1 О) -2.106 * 1050 = -\frac{2106}{1000} * 1050 = -\frac{2106 * 1050}{1000} = -2211.3