Выполните действия: $$1.2 - \frac{7}{20}$$ $$\frac{11}{15} + 0.2$$ $$0.36 : \frac{3}{5}$$

1. $$1.2 - \frac{7}{20} = \frac{12}{10} - \frac{7}{20} = \frac{12 \cdot 2}{10 \cdot 2} - \frac{7}{20} = \frac{24}{20} - \frac{7}{20} = \frac{24 - 7}{20} = \frac{17}{20} = \frac{17 \cdot 5}{20 \cdot 5} = \frac{85}{100} = 0.85$$ 2. $$\frac{11}{15} + 0.2 = \frac{11}{15} + \frac{2}{10} = \frac{11}{15} + \frac{1}{5} = \frac{11}{15} + \frac{1 \cdot 3}{5 \cdot 3} = \frac{11}{15} + \frac{3}{15} = \frac{11 + 3}{15} = \frac{14}{15}$$ 3. $$0.36 : \frac{3}{5} = \frac{36}{100} : \frac{3}{5} = \frac{36}{100} \cdot \frac{5}{3} = \frac{12 \cdot 3}{20 \cdot 5} \cdot \frac{5}{3} = \frac{12 \cdot \cancel{3} \cdot \cancel{5}}{20 \cdot \cancel{5} \cdot \cancel{3}} = \frac{12}{20} = \frac{3 \cdot 4}{5 \cdot 4} = \frac{3}{5} = \frac{3 \cdot 2}{5 \cdot 2} = \frac{6}{10} = 0.6$$ Ответ: $$1.2 - \frac{7}{20} = 0.85$$ $$\frac{11}{15} + 0.2 = \frac{14}{15}$$ $$0.36 : \frac{3}{5} = 0.6$$