Вычислите наиболее удобным способом: 19/21+1/5+2/21.

\[\frac{19}{21} + \frac{1}{5} + \frac{2}{21} = \frac{19 + 2}{21} + \frac{1}{5} =\]

\[= \frac{21}{21} + \frac{1}{5} = 1 + \frac{1}{5} = 1\frac{1}{5}.\]