Выполните действия: 20:(6 3/14+1 11/14)-(4 1/4-2 3/4):5=
20:(6 3/14+1 11/14)-(4 1/4-2 3/4):5= 20:8 - (1 1/2):5 = 5/2 - 3/10 = 25/10 - 3/10 = 22/10 = 11/5 = 2 1/5