\[\ \boxed{\mathbf{2.}\mathbf{105.\ }\mathbf{ОК\ ГДЗ - домашка\ на\ }5}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{4}{8};\]
\[НОД(4,\ 8) = 4.\]
\[\textbf{б)}\ \frac{15}{25};\ \]
\[15 = 3 \cdot 5;\ \ 25 = 5 \cdot 5\]
\[НОД(15,25) = 5.\]
\[\textbf{в)}\ \frac{33}{99};\]
\[НОД(33,\ 99) = 33.\]
\[\textbf{г)}\ \frac{51}{85};\]
\[51 = 3 \cdot 17;\ \ 85 = 5 \cdot 17\]
\[НОД(51,\ 87) = 17.\]