13. Выполни вычисления. 187+75, 850-86, 238+93, 540+30, 540+300, 540+330, 17·4:2, 28·3:4, 18·5:3, 42:14·26, 60:12·14, 90:15·13

187 + 75 = 262
850 - 86 = 764
238 + 93 = 331
540 + 30 = 570
540 + 300 = 840
540 + 330 = 870
17 * 4 / 2 = 34
28 * 3 / 4 = 21
18 * 5 / 3 = 30
42 / 14 * 26 = 78
60 / 12 * 14 = 70
90 / 15 * 13 = 78