a) 583 - 479 – 483 - 479
1) 583 - 479 = 104
2) 483 - 479 = 4
3) 104 - 4 = 100
Ответ: 100
б) 49 ⋅ 68 – 7650 : 17 + 33
1) 49 ⋅ 68 = 3332
2) 7650 : 17 = 450
3) 3332 - 450 = 2882
4) 2882 + 33 = 2915
Ответ: 2915