Найдите значение выражения 1/4 * 2

1. $\frac{1}{4} \cdot 2 = \frac{2}{4} = 0,5$ 2. $\frac{6}{5} \cdot \frac{33}{4} = \frac{6 \cdot 33}{5 \cdot 4} = \frac{3 \cdot 33}{5 \cdot 2} = \frac{99}{10} = 9,9$ 3. $\frac{23}{4} : \frac{5}{2} = \frac{23}{4} \cdot \frac{2}{5} = \frac{23 \cdot 2}{4 \cdot 5} = \frac{23}{2 \cdot 5} = \frac{23}{10} = 2,3$ 4. $(2\frac{1}{3} - 1\frac{14}{15}) \cdot 45 = (\frac{7}{3} - \frac{29}{15}) \cdot 45 = (\frac{35}{15} - \frac{29}{15}) \cdot 45 = \frac{6}{15} \cdot 45 = 6 \cdot 3 = 18$ 5. $(\frac{23}{5} - \frac{7}{2}) \cdot \frac{7}{26} = (4,6 - 3,5) \cdot \frac{7}{26} = 1,1 \cdot \frac{7}{26} = \frac{11}{10} \cdot \frac{7}{26} = \frac{77}{260} \approx 0,296$ 6. $\frac{6}{\frac{1}{19} + \frac{1}{5}} = \frac{6}{\frac{5 + 19}{95}} = \frac{6}{\frac{24}{95}} = 6 \cdot \frac{95}{24} = \frac{95}{4} = 23,75$ 7. $27 \cdot (\frac{2}{3})^2 + 18 \cdot \frac{2}{3} = 27 \cdot \frac{4}{9} + 6 \cdot 2 = 3 \cdot 4 + 12 = 12 + 12 = 24$ 8. $1\frac{7}{8} : (1\frac{5}{6} + 2\frac{1}{3}) = \frac{15}{8} : (\frac{11}{6} + \frac{14}{6}) = \frac{15}{8} : \frac{25}{6} = \frac{15}{8} \cdot \frac{6}{25} = \frac{3 \cdot 3}{4 \cdot 5} = \frac{9}{20} = 0,45$ 9. (\frac{1}{2} - \frac{1}{4}) \cdot 1\frac{1}{3} = \frac{1}{4} \cdot \frac{4}{3} = \frac{1}{3} \approx 0,333$ 10. $2,8 \cdot 6,5 = 18,2$ 11. $\frac{3,9}{1,3} = 3$ 12. $\frac{8,1}{5,5 - 4,6} = \frac{8,1}{0,9} = 9$ 13. $\frac{72}{2,5 \cdot 2,4} = \frac{72}{6} = 12$ 14. $-4,1 - 7 \cdot (-7,2) = -4,1 + 50,4 = 46,3$ 15. $\frac{3}{5} : (-\frac{4}{21}) + 3,2 = -\frac{3}{5} \cdot \frac{21}{4} + 3,2 = -\frac{63}{20} + 3,2 = -3,15 + 3,2 = 0,05$