Выполните действия: a) $$1\frac{9}{11} + 2\frac{3}{11} = (1+2) + (\frac{9}{11} + \frac{3}{11}) = $$

$$1\frac{9}{11} + 2\frac{3}{11} = (1+2) + (\frac{9}{11} + \frac{3}{11}) = 3 + \frac{12}{11} = 3 + 1\frac{1}{11} = 4\frac{1}{11}$$