Вычислите, используя законы умножения (918-920)​

) 48 * 5/17 + 48 * 12/17 = 48 * (5/17 + 12/17) = 48 * 17/17 = 48 * 1 = 48.11/13 * 11/15 + 11/13 * 2/15 = 11/13 * (11/15 + 2/15) = 11/13 * 13/15 = 11/15.22/21 * 5/14 + 2O/21 * 5/14 = 5/14 * (22/21 + 2O/21) = 5/14 * 42/21 = 5/14 * 2 = (5 * 2)/14 = 5/7.