а)
\[ \frac{9.6}{3} = \frac{3.6}{\frac{1}{4}x} \]
\[ 3.2 = \frac{3.6}{\frac{1}{4}x} \]
\[ \frac{1}{4}x = \frac{3.6}{3.2} \]
\[ \frac{1}{4}x = \frac{36}{32} = \frac{9}{8} \]
\[ x = \frac{9}{8} \times 4 = \frac{9}{2} = 4.5 \]
б)
\[ 8\frac{2}{3} = \frac{8 \times 3 + 2}{3} = \frac{26}{3} \]
\[ 6 : (4x) = 2.6 : \frac{26}{3} \]
\[ \frac{6}{4x} = \frac{3}{2x} \]
\[ 2.6 : \frac{26}{3} = \frac{26}{10} \times \frac{3}{26} = \frac{3}{10} \]
\[ \frac{3}{2x} = \frac{3}{10} \]
\[ 2x = 10 \]
\[ x = \frac{10}{2} = 5 \]
Ответ:
а) x = 4.5
б) x = 5