\[ (3,8 + 4,6)a = 13,44 \]
\[ 8,4a = 13,44 \]
\[ a = \frac{13,44}{8,4} \]
\[ a = 1,6 \]
\[ (1 - 0,872)b = 32 \]
\[ 0,128b = 32 \]
\[ b = \frac{32}{0,128} \]
\[ b = 250 \]
\[ (4,9 - 0,1)m = 3,84 \]
\[ 4,8m = 3,84 \]
\[ m = \frac{3,84}{4,8} \]
\[ m = 0,8 \]
Ответ: 4) a = 1,6; 5) b = 250; 6) m = 0,8.