Вычисли значения выражений: 1) $1\frac{7}{18} - \frac{4}{15}$

*1) $1\frac{7}{18} - \frac{4}{15} = \frac{25}{18} - \frac{4}{15} = \frac{25 \cdot 5}{18 \cdot 5} - \frac{4 \cdot 6}{15 \cdot 6} = \frac{125}{90} - \frac{24}{90} = \frac{101}{90} = 1\frac{11}{90}$* *2) $4\frac{4}{5} \cdot 4\frac{1}{6} = \frac{24}{5} \cdot \frac{25}{6} = \frac{24 \cdot 25}{5 \cdot 6} = \frac{6 \cdot 4 \cdot 5 \cdot 5}{5 \cdot 6} = 4 \cdot 5 = 20$* *3) $3\frac{1}{9} : 4\frac{2}{3} = \frac{28}{9} : \frac{14}{3} = \frac{28}{9} \cdot \frac{3}{14} = \frac{14 \cdot 2 \cdot 3}{3 \cdot 3 \cdot 14} = \frac{2}{3}$* *4) $(30:27 - \frac{1}{3}) \cdot 2\frac{1}{7} + \frac{2}{5} = (\frac{30}{27} - \frac{1}{3}) \cdot \frac{15}{7} + \frac{2}{5} = (\frac{10}{9} - \frac{1}{3}) \cdot \frac{15}{7} + \frac{2}{5} = (\frac{10}{9} - \frac{3}{9}) \cdot \frac{15}{7} + \frac{2}{5} = \frac{7}{9} \cdot \frac{15}{7} + \frac{2}{5} = \frac{7 \cdot 3 \cdot 5}{3 \cdot 3 \cdot 7} + \frac{2}{5} = \frac{5}{3} + \frac{2}{5} = \frac{5 \cdot 5}{3 \cdot 5} + \frac{2 \cdot 3}{5 \cdot 3} = \frac{25}{15} + \frac{6}{15} = \frac{31}{15} = 2\frac{1}{15}$* **Ответы:** *1) $1\frac{11}{90}$* *2) $20$* *3) $\frac{2}{3}$* *4) $2\frac{1}{15}$*