Răspuns :
a-(c+c+c)
=777-(222+222+222)
=777-(222×3)
=777-666
=111
b-(c+c)
=999-(222+222)
=999-(222×2)
=999-444
=555
=777-(222+222+222)
=777-(222×3)
=777-666
=111
b-(c+c)
=999-(222+222)
=999-(222×2)
=999-444
=555