Ответ:

a) 5 * (32 + 17) = 5 * 49 = 245; (10 - 2) * 11 = 8 * 11 = 88; б) 5 * 9 - 5 * 8 = 5 * (9-8) = 5 * 1 = 5; в) 13 - (4 - 7) = 13 - (-3) = 13 + 3 = 16