Помогите решить пожалуйста

(1)

1) 3 3/8 - 1 1/2 = 3 3/8 - 1 4/8 = 1 7/8
2) 5/4 : 1 7/8 = 5/4 : 15/8 = 5/4 * 8/15 = 2/3
=====================================
(2)

1) 5/15 + 1/12 = 1/3 + 1/12 = 4/12 + 1/12 = 5/12
2) 5/12 * 30 = 25/2=12 1/2
==========================

$1) 3 \frac{3}{8} -1 \frac{1}{2} =3 \frac{3}{8} -1 \frac{4}{8} =1 \frac{7}{8} \\ 2) \frac{5}{4} :1 \frac{7}{8} = \frac{5}{4} : \frac{15}{8} = \frac{5}{4} * \frac{8}{15} = \frac{2}{3} \\ \\ \\ 1) \frac{5}{15} + \frac{1}{12} = \frac{1}{3} + \frac{1}{12} = \frac{4}{12} + \frac{1}{12} = \frac{5}{12} \\ 2) \frac{5}{12} * \frac{30}{1} = \frac{25}{2} =12,5$