1. b = 7214 - 5768 = 1446
b = 2536 + 1928 = 4464
d = 4237 +3872 = 8109
f = 9864-5407 = 4457
2. b) a+b = 7458 iar a = 4964
4964 + b = 7458
b = 7458 - 4964
b = 2494
c) 4975 - s = 3892
s = 4975 - 3892
s = 1083
d) 4376+ b = 9000
b = 9000 - 4376
b = 4624
3. (7600 -4563) +a = 5284
3037 + a = 5284
a = 5284 - 3037 = 2247
a-(5170 - 2184) = 1208
a -2986 = 1208
a = 1208 + 2986 = 4194
(6734 + 2209) -a = 3496
8943 -a = 3496
a = 8943 - 3496= 5447
