Răspuns :
(891-11)-[(83-3)x10+70]:3=880-(80x10+70]:3=880-(800+70):3=880-870:3=880-290=590
(9x 99 - 99:9) - [(83 - 27:9) x 10 + 2x35 ] : 3 = 891-11 - [(83 - 3) x 10 + 70] :3
880 - (80x10 + 70) : 3 = 880 - (800 + 70):3 = 880 - 870:3 = 880 - 290 = 590
880 - (80x10 + 70) : 3 = 880 - (800 + 70):3 = 880 - 870:3 = 880 - 290 = 590