39/8: (11/4+29/19).

1)11/4+29/19=(11 × 19  +  29 × 4)/76 = 209/76  +  116/76 =  325/76 = 4 21/762)39/8÷4 21/76 =39/8  ÷  325/76 = 39/8  ×  76/325 =  57/50 = 1 7/50=1,14ответ 1 7/50 = 1,14