a) $$1 \frac{1}{4} = \frac{1 \cdot 4 + 1}{4} = \frac{5}{4}$$
б) $$3 \frac{4}{5} = \frac{3 \cdot 5 + 4}{5} = \frac{19}{5}$$
в) $$7 \frac{1}{6} = \frac{7 \cdot 6 + 1}{6} = \frac{43}{6}$$
г) $$1 \frac{13}{24} = \frac{1 \cdot 24 + 13}{24} = \frac{37}{24}$$
Ответ: a) 5/4; б) 19/5; в) 43/6; г) 37/24