30 • (1 целая 5/6x+3целых 1/5)=231

30 * (11х/6 + 16/5) = 23111х/6 + 16/5 = 231/3011х/6 + 16/5 = 77/1011х/6 = 77/10 - 16/511х/6 = 77/10 - 32/1011х/6 = 45/10х = 45/10 : 11/6х = 45/10 * 6/11х = 27/11Проверка: 30 * (11/6 * 27/11 + 16/5) = 30 * (9/2 + 16/5) = 30 * ( 45/10 + 32/10) = 30 * 77/10 = 231 - верноОтвет: 27/11