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9+10X{9+10X[9+10x(9+10x9)-9]-9}-9=


Răspuns :

9+10x[9+10x(9+10x99-9)-9]-9=
9+10x(9+10x990-9)-9=
9+10x9900-9=
=99000
=9+10*{9+10*[9+10*(9+90)-9]-9}-9
=9+10*{9+10*[9+10*99-9]-9}-9
=9+10*{9+10*[9+190-9]-9}-9
=9+10*{9+10*190-9}-9
=9+10*1900-9
=9+19000-9
=19000