Răspuns :
1587+a-357=1643
1587+a=1643+357
1587+a=2000
a=2.000-1587
a=413
.......................... ................
8053+b-5495=4506
8053+b=4506+5495
8053+b=10.001
b=10.001-8054
b=1947
1587+a=1643+357
1587+a=2000
a=2.000-1587
a=413
.......................... ................
8053+b-5495=4506
8053+b=4506+5495
8053+b=10.001
b=10.001-8054
b=1947
1587 + a - 357 = 1643
a = 1587 - 1643 - 357
a = e gresit exerciciul
8053 + b - 5495 = 1643
b = 8053 - 1643 - 5495
b = 915
V: 8053 + 915 - 5495 = 1643