a) 776 ⋅ 16 + 324 ⋅ 16 = (776 + 324) ⋅ 16 = 1100 ⋅ 16 = 17600
б) 384 ⋅ 15 - 124 ⋅ 15 = (384 - 124) ⋅ 15 = 260 ⋅ 15 = 3900
в) 28350 : 225 ⋅ 45 - 1673 = 126 ⋅ 45 - 1673 = 5670 - 1673 = 3997
г) (4976 + 1524) ⋅ 4 - 3568 = 6500 ⋅ 4 - 3568 = 26000 - 3568 = 22432
Ответ: а) 17600; б) 3900; в) 3997; г) 22432.