4. Вычисли: 51 - 15 : 6 + 18 + 7 38 : 19 + 42 : 3 = 16 * 6 : 3 - 30 = 28 : 2 * 3 + 8 = 610 + 70 = 570 - (320 – 20) = 56 + 4 * 8 - 20 (47 + 8) : 11 = (86 - 72) * 5 = 90 - 9 : 9 =

Выполним вычисления по порядку действий: * 51 - 15 : 6 + 18 + 7 = 51 - 2.5 + 18 + 7 = 73.5 * 38 : 19 + 42 : 3 = 2 + 14 = 16 * 16 * 6 : 3 - 30 = 96 : 3 - 30 = 32 - 30 = 2 * 28 : 2 * 3 + 8 = 14 * 3 + 8 = 42 + 8 = 50 * 610 + 70 = 680 * 570 - (320 – 20) = 570 - 300 = 270 * 56 + 4 * 8 - 20 = 56 + 32 - 20 = 88 - 20 = 68 * (47 + 8) : 11 = 55 : 11 = 5 * (86 - 72) * 5 = 14 * 5 = 70 * 90 - 9 : 9 = 90 - 1 = 89