Răspuns:
b.657×999=656.343
813×999=812.187
672×999=671.328
Explicație pas cu pas:
657×999=657×(1000-1)=
=657×1000-657×1=
=657000-657=656.343
813×999=813×(1000-1)=
=813×1000-813×1=
=813000-813=812.187
672×999=672×(1000-1)=
=672×1000-672×1=
=672000-672=671.282
