\[\boxed{\mathbf{3.46}\mathbf{.\ ОК\ ГДЗ - домашка\ на\ }5}\]
Пояснение.
Решение.
\[12 \cdot 4 = 160 \cdot 0,3\]
\[\frac{12}{0,3} = \frac{160}{4};\ \ \ \frac{0,3}{12} = \frac{4}{160};\]
\[\text{\ \ }\frac{120}{3} = \frac{160}{4};\ \ \frac{3}{120} = \frac{4}{160};\]
\[\frac{4}{0,3} = \frac{160}{12};\ \frac{40}{3} = \frac{160}{12};\ \ \]
\[\frac{0,3}{4} = \frac{12}{160};\ \frac{3}{40} = \frac{12}{160}.\]