63-51= 52-2= 62+15= 48-22=
59-28= 52+18= 36-31= 85-43=
75+4= 74+15= 88-8= 24+13=
23+3+45=
56-32=
67+21=
6+35+52=
87-7=
66+5=
31+21+2=
78-23=
98-4+6=
55+45=
56+23= 77+12=
67+20= 58+12=
63-23= 35+33=
39+42=
53+23= 86-43= 14+64= 76-16= 97-42= 34+54=
23+15= 88-46= 79-10= 65+11=
69-32= 16+25= 30+48= 77-44=
19+50= 96-44= 24+12= 85-44=
85-5= 89-9= 50+6= 34+20=
23-3= 53-3= 62+8= 70-60=
(元)
18+<30
69- >35
38+52 54+37 68﹣42 68﹣43