Ответ:\(999+1=1000\)\(700+80+9=789\)\(34-7-40=27-40=-13\)\(570+30-330=600-330=270\)\(900-1=899\)\(960+50-660=1010-660=350\)Ответ: 1000; 789; −13; 270; 899; 350.