Răspuns :
10-| 81-135:(6-24:24) | :9+4:4=
=10- | 81-135:(6-1) | :9+4:4=
=10-(81-135:5):9+4:4=
=10-(81-27):9+4:4=
=10-54:9+4:4=
=10-6+1=
=4+1=
=5
=10- | 81-135:(6-1) | :9+4:4=
=10-(81-135:5):9+4:4=
=10-(81-27):9+4:4=
=10-54:9+4:4=
=10-6+1=
=4+1=
=5