a) 583⋅479-483⋅479 = 479⋅(583-483) = 479 ⋅ 100 = 47900
б) 49 ⋅ 68 - 7650 : 17 + 33 = 3332 - 450 + 33 = 2815
в) $$4^3 + 7^2 = 4 \cdot 4 \cdot 4 + 7 \cdot 7 = 64 + 49 = 113$$
Ответ: a) 47900; б) 2815; в) 113