2. Найдем значение выражения:
a) $$11\frac{4}{15} + \frac{1}{10} + 1\frac{3}{45}$$
- $$11\frac{4}{15} + \frac{1}{10} + 1\frac{3}{45} = 11\frac{4 \cdot 6}{15 \cdot 6} + \frac{1 \cdot 9}{10 \cdot 9} + 1\frac{3 \cdot 2}{45 \cdot 2} = 11\frac{24}{90} + \frac{9}{90} + 1\frac{6}{90} = 12\frac{39}{90} = 12\frac{13}{30}$$
б) $$7 - 4\frac{5}{9}$$
- $$7 - 4\frac{5}{9} = 6\frac{9}{9} - 4\frac{5}{9} = 2\frac{4}{9}$$
г) $$6\frac{15}{21} + 2\frac{9}{14}$$
- $$6\frac{15}{21} + 2\frac{9}{14} = 6\frac{5}{7} + 2\frac{9}{14} = 6\frac{5 \cdot 2}{7 \cdot 2} + 2\frac{9}{14} = 6\frac{10}{14} + 2\frac{9}{14} = 8\frac{19}{14} = 9\frac{5}{14}$$
Ответ: а) $$12\frac{13}{30}$$; б) $$2\frac{4}{9}$$; г) $$9\frac{5}{14}$$