234:9+[4000-(31+7)×15]:5-219:3​

Răspuns :

26+(4000-570):5- 73=
=26+3430:5-73=
=26+686-73=
=639

=26+(4000-38×15):5-73

=26×(4000-570):5-73

=26×3430:5-73

=89180:5-73

=17836-73

=17763