Помогите решить(1 7\12 - 1 19\42)*36+4 2\7* 2,1=

Question

Помогите решить
(1 7\12 - 1 19\42)*36+4 2\7* 2,1=

Answer 1

(1 7\12 - 1 19\42)*36+4 2\7* 2,1= 13 5/7

1 7\12 - 1 19\42 = 19/12 - 61/42 = 133/84 - 122/84 = 11/84
11/84*36=33/7 = 4 5/7

4 2\7* 2,1 = 30/7 * 2 1/10=30/7* 21/10=9

4 5/7 + 9 = 13 5/7