34-3=
57-2=
39-6=
77-6=
97-81=
889=79 3620=56 4030=10
377=44 456=51 246=18
7810=68 2540=65 7860=18
48+51100 87-1341+26 67-5087-42
45-2223 59-3023+15 15+1265-41
88-=5 +10=36 +7﹤78
18+40﹥ 72-=22 -21﹤10