a) 3817 + 2599 + 1183 = (3817 + 1183) + 2599 = 5000 + 2599 = 7599
б) 759 - (259 + 413) = 759 - 259 - 413 = 500 - 413 = 87
в) 125 × 567 × 8 = 567 × (125 × 8) = 567 × 1000 = 567000
г) 4 × 197 × 25 = 197 × (4 × 25) = 197 × 100 = 19700
Ответ: a) 7599; б) 87; в) 567000; г) 19700