Răspuns :
5+6+7+8+9+10+11+12+13=
=11+7+8+9+10+11+12+13=
=18+8+9+10+11+12+13=
=26+9+10+11+12+13=
=35+10+11+12+13=
=45+11+12+13=
=56+12+13=
=68+13=
=81=
=11+7+8+9+10+11+12+13=
=18+8+9+10+11+12+13=
=26+9+10+11+12+13=
=35+10+11+12+13=
=45+11+12+13=
=56+12+13=
=68+13=
=81=