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(9x999-999:9):10-[444-6-(400-400:10)]

Răspuns :

(9x999-999:9):10-[444-6-(400-400:10)]=
(8991-999:9):10-[444-6-(400-400:10)]=
(8991-111):10-[444-6-(400-400:10)]=
8880:10-[444-6-(400-400:10)]=
888-[444-6-(400-400:10)]=
888-[444-6-(400-40)]=
888-(444-6-360)=
888-(438-360)=
888-78=810