Răspuns :
Explicație pas cu pas:
1658+2347=4005
4005-1658=2347
4005-2347=1658
7462+2371=9833
9833-2371=7462
9833-7462=2371
8460-4580=3780
3780+4580=8460
5309+1863= 7172
7172-5303=1863
1658+2347=4005
4005-2347=1658
7462+2371 =9833
9833-2371=7462
8460-4580=3780
3780+4580=8460
5309+1863=7172
7172-1863=5309
4005-2347=1658
7462+2371 =9833
9833-2371=7462
8460-4580=3780
3780+4580=8460
5309+1863=7172
7172-1863=5309