а) \(3\frac{7}{15}+1.4=3\frac{7}{15}+1\frac{2}{5}=4\frac{7}{15}+\frac{6}{15}=4\frac{13}{15}\).
б) \(3\frac{1}{8}+1.105=3.125+1.105=4.23\).
Ответ: а) \(4\frac{13}{15}\); б) \(4,23\).