\[\boxed{\mathbf{2.}\mathbf{134}\mathbf{.\ ОК\ ГДЗ - домашка\ на\ }5}\]
Пояснение.
Решение.
\[\textbf{а)}\frac{7}{16};\ \frac{3}{8} = \frac{6}{16}\]
\[\textbf{б)}\frac{9}{20} = \frac{27}{60};\ \frac{21}{60}\]
\[\textbf{в)}\ \frac{14}{75} = \frac{28}{150};\ \ \frac{13}{30} = \frac{65}{150}\]
\[\textbf{г)}\ \frac{17}{20} = \frac{85}{100};\ \ \frac{7}{25} = \frac{28}{100}\]
\[\textbf{д)}\ \frac{12}{55} = \frac{24}{110};\ \ \frac{17}{22} = \frac{85}{110}\]
\[\textbf{е)}\ 42 = 2 \cdot 3 \cdot 7;\ \ 147 = 3 \cdot 7 \cdot 7\]
\[НОК = 3 \cdot 7 \cdot 7 \cdot 2 = 294\ \]
\[\frac{25}{42} = \frac{25 \cdot 7}{42 \cdot 7} = \frac{135}{294};\ \ \frac{55}{147} =\]
\[= \frac{55 \cdot 2}{294} = \frac{110}{294}\]
\[\textbf{ж)}\ 750 = 2 \cdot 3 \cdot 5 \cdot 5 \cdot 5;\ \ 450 =\]
\[= 2 \cdot 3 \cdot 3 \cdot 5 \cdot 5\]
\[НОК = 2 \cdot 3 \cdot 5 \cdot 5 \cdot 5 \cdot 3 = 2250\]
\[\frac{13}{750} = \frac{13 \cdot 3}{750 \cdot 3} = \frac{39}{2250};\ \ \frac{7}{450} =\]
\[= \frac{7 \cdot 5}{450 \cdot 5} = \frac{35}{2250}\]
\[3)\ 375 = 3 \cdot 5 \cdot 5 \cdot 5;\ \ 225 =\]
\[= 3 \cdot 3 \cdot 5 \cdot 5\]
\[НОК = 3 \cdot 5 \cdot 5 \cdot 5 \cdot 3 = 1125\]
\[\frac{21}{225} = \frac{21 \cdot 5}{225 \cdot 5} = \frac{105}{1125};\ \ \frac{14}{375} =\]
\[= \frac{14 \cdot 3}{375 \cdot 3} = \frac{42}{1125}\]