Решим заданные примеры, соблюдая порядок арифметических действий: а) 4 * (18 : 9) * 7 - 64 : 8 = 244. 1) 18 : 9 = 9, 2) 4 * 9 = 36, 3) 36 * 7 = 252, 4) 64 : 8 = 8, 5) 252 - 8 = 244. б) 80 - (25 : 5 + 9) : 2 - 13 = 60. 1) 25 : 5 = 5, 2) 5 + 9 = 14, 3) 14 : 2 = 7, 4) 80 - 7 = 73, 5) 73 - 13 = 60. в) 2 * 9 - 36 : (3 + 8 : 6) = 9 9/13. 1) 8 : 6 = 8/6 = 1 2/6 = 1 1/3, 2) 3 + 1 1/3 = 4 1/3, 3) 36 : 4 1/3 = 36 : 13/3 = 36 * 3/13 = 108/13 = 8 4/13, 4) 2 * 9 = 18, 5) 18 - 8 4/13 = 10 - 4/13 = 9 + (1 - 4/13) = 9 + (13/13 - 4/13) = 9 + 9/13 = 9 9/13. г) 4 + 4 : 2 + (30 - 15) : 3 = 11. 1) 30 - 15 = 15, 2) 15 : 3 = 5, 3) 4 : 2 = 2, 4) 4 + 2 = 6, 5) 6 + 5 = 11.