Вычислите: 11/20 - 12/25 - 13/50

Решу примеры из документа: **Страница 6** 1) $\frac{11}{20} - \frac{12}{25} - \frac{13}{50} = \frac{55}{100} - \frac{48}{100} - \frac{26}{100} = -\frac{19}{100} = -0,19$ 2) $\frac{11}{16} - \frac{9}{10} - \frac{3}{24} = \frac{11}{16} - \frac{9}{10} - \frac{1}{8} = \frac{55}{80} - \frac{72}{80} - \frac{10}{80} = -\frac{27}{80} = -0,3375$ 3) $2 - \frac{32}{45} : \frac{16}{15} = 2 - \frac{32}{45} \cdot \frac{15}{16} = 2 - \frac{2}{3} \cdot 1 = 2 - \frac{2}{3} = 1 \frac{1}{3} \approx 1,333$ 4) $\frac{8}{15} \cdot (\frac{7}{8} + \frac{5}{24}) = \frac{8}{15} \cdot (\frac{21}{24} + \frac{5}{24}) = \frac{8}{15} \cdot \frac{26}{24} = \frac{1}{15} \cdot \frac{26}{3} = \frac{26}{45} \approx 0,5778$ 5) $\frac{16}{23} - \frac{28}{45} - 1 = \frac{720}{1035} - \frac{644}{1035} - \frac{1035}{1035} = -\frac{959}{1035} \approx -0,9266$ 6) $\frac{5}{9} - \frac{9}{16} - \frac{21}{28} = \frac{5}{9} - \frac{9}{16} - \frac{3}{4} = \frac{80}{144} - \frac{81}{144} - \frac{108}{144} = -\frac{109}{144} \approx -0,7569$ **Страница 7** 1) $\frac{4}{5} - \frac{5}{24} - \frac{29}{32} = \frac{384}{480} - \frac{100}{480} - \frac{435}{480} = -\frac{151}{480} \approx -0,3146$