\(\boxed{\mathbf{2.}\mathbf{221}\mathbf{.\ ОК\ ГДЗ - домашка\ на\ }5}\)
\[1 = 6\ клеток;\ \frac{a}{b} = \frac{4}{6}.\]
\[\textbf{а)}\ 1 - \frac{a}{b}\]
\[A = 1 - \frac{4}{6} = \frac{2}{6}.\]
\[\textbf{б)}\ 2 + \frac{a}{b}\ \]
\[B = 2 + \frac{4}{6} = 2\frac{4}{6}.\]
\[\textbf{в)}\ 3 - \frac{a}{b}\]
\[C = 3 - \frac{4}{6} = 2\frac{2}{6}.\]