1)522 + 376 = 898
898 - 376 = 522
2)689 - 231 = 458
231 + 458 = 689
3)345 - 201 = 144
201 + 144 = 345
4)987 - 679 = 308
308 + 679 = 987
1)522 + 376 = 898
898 - 376 = 522
2)689 - 231 = 458
231 + 458 = 689
3)345 - 201 = 144
201 + 144 = 345
4)987 - 679 = 308
308 + 679 = 987
Проверка
898-376=522
689-231=458
Проверка
458+231=689
345-201=144
Проверка
144+201=345
987-679=308
Проверка
308+679=987