Răspuns :
a |-----|-----|-----|+7
}631
b |-----|
631-7=624
b=624:4=156
a=156×3+7
a=468+7
a=475
Verificare: 156+475=631
475:156=3 rest 7
}631
b |-----|
631-7=624
b=624:4=156
a=156×3+7
a=468+7
a=475
Verificare: 156+475=631
475:156=3 rest 7