Ответ:\(30-7=23\)\(37-4=33\)\(81+9=90\)\(58+30=88\)\(80-4=76\)\(90-3=87\)\(57-3=54\)\(29-8=21\)\(30-8=22\)\(38+40=78\)\(30+42=72\)\(40-7=33\)\(75-50=25\)\(84+6=90\)\(78-7=71\)