1 3 κα: 3 ·5= +24= *1 2= *2= -14= -10= 5 15 5 1 3 кка: 3 ·4= *4= +44= /3= -52= -6= 5 5 4 3

\[\frac{1}{3} \cdot \frac{3}{5} + 2\frac{4}{5} = \]

\[\frac{1 \cdot 3}{3 \cdot 5} + \frac{2 \cdot 5 + 4}{5} = \]

\[\frac{3}{15} + \frac{14}{5} = \frac{3}{15} + \frac{14 \cdot 3}{5 \cdot 3} = \frac{3}{15} + \frac{42}{15} = \frac{45}{15} = 3\]

\[3 \cdot 1\frac{2}{15} = 3 \cdot \frac{1 \cdot 15 + 2}{15} = 3 \cdot \frac{17}{15} = \frac{51}{15} = \frac{17}{5} = 3\frac{2}{5}\]

\[3\frac{2}{5} \cdot 2 = \frac{3 \cdot 5 + 2}{5} \cdot 2 = \frac{17}{5} \cdot 2 = \frac{34}{5} = 6\frac{4}{5}\]

\[6\frac{4}{5} - 1\frac{4}{5} = 6\frac{4}{5} - 1\frac{4}{5} = (6 - 1) + (\frac{4}{5} - \frac{4}{5}) = 5\]

\[5 - 10 = -5\]

\[\frac{1}{3} \cdot \frac{3}{4} \cdot \frac{4}{5} + 4\frac{4}{5} = \]

\[\frac{1 \cdot 3}{3 \cdot 4} \cdot \frac{4}{5} + \frac{4 \cdot 5 + 4}{5} = \frac{3}{12} \cdot \frac{4}{5} + \frac{24}{5} = \frac{1}{4} \cdot \frac{4}{5} + \frac{24}{5} = \frac{1 \cdot 4}{4 \cdot 5} + \frac{24}{5} = \frac{4}{20} + \frac{24}{5} = \frac{1}{5} + \frac{24}{5} = \frac{25}{5} = 5\]

\[5 : \frac{3}{4} = \frac{5}{1} : \frac{3}{4} = \frac{5}{1} \cdot \frac{4}{3} = \frac{20}{3} = 6\frac{2}{3}\]

\[6\frac{2}{3} - 5\frac{2}{3} = (6 - 5) + (\frac{2}{3} - \frac{2}{3}) = 1\]

\[1 - 6 = -5\]