Задание 6(1): Найдите значение выражения

Привет! Давай решим примеры из твоего задания. 1) $(\frac{11}{12} + \frac{11}{20}) \cdot \frac{15}{8} = (\frac{55}{60} + \frac{33}{60}) \cdot \frac{15}{8} = \frac{88}{60} \cdot \frac{15}{8} = \frac{11}{7.5} \cdot \dots$ Проще сократить: $(\frac{88}{60}) \cdot \frac{15}{8} = \frac{11}{15} \cdot \frac{15}{8} = \frac{11}{8} = 1.375$ 2) $(\frac{9}{10} - \frac{7}{15}) \cdot 3 = (\frac{27}{30} - \frac{14}{30}) \cdot 3 = \frac{13}{30} \cdot 3 = \frac{13}{10} = 1.3$ 3) $\frac{9}{25} - \frac{1}{2} = \frac{18}{50} - \frac{25}{50} = -\frac{7}{50} = -0.14$ 4) $\frac{1}{5} - \frac{3}{4} = \frac{4}{20} - \frac{15}{20} = -\frac{11}{20} = -0.55$ 5) $(\frac{3}{8} - \frac{1}{20}) \cdot 10 = (\frac{15}{40} - \frac{2}{40}) \cdot 10 = \frac{13}{40} \cdot 10 = \frac{13}{4} = 3.25$ 6) $6.1 - 4.5 \cdot 5.4 = 6.1 - 24.3 = -18.2$ 7) $\frac{4.7 - 6.8}{1.4} = \frac{-2.1}{1.4} = -1.5$ 8) $(\frac{5}{26} - \frac{3}{25}) \cdot \frac{13}{2} = (\frac{125}{650} - \frac{78}{650}) \cdot \frac{13}{2} = \frac{47}{650} \cdot \frac{13}{2} = \frac{47 \cdot 13}{650 \cdot 2} = \frac{47}{50 \cdot 2} = \frac{47}{100} = 0.47$ 9) $\frac{1}{\frac{1}{42} - \frac{1}{91}} = \frac{1}{\frac{13-6}{546}} = \frac{1}{\frac{7}{546}} = \frac{546}{7} = 78$