Решение:
a) 4357 + 8829 - 3357 = (4357 - 3357) + 8829 = 1000 + 8829 = 9829
б) 9389 + 6584 - 6584 = 9389 + (6584 - 6584) = 9389 + 0 = 9389
в) 9356 - (4356 + 2888) = 9356 - 4356 - 2888 = (9356 - 4356) - 2888 = 5000 - 2888 = 2112
г) 61326 - 9989 + 51326 = (61326 + 51326) - 9989 = 112652 - 9989 = 102663