59-3= 67-5= 74-4= 89-8= 97-6=
59-30= 67-50= 74-40= 89-80= 97-60=
16-8= 40+2= 15-6+7= 7+10-9=
78-8= 16-9= 17-9+8= 12-5-4=
12-9= 17-8= 14-4-2= 3+9-5=
60+7= 20+9= 87-7= 55-50=
12+24= 96-51= 18-9= 37-15=
32+7= 79-40= 52+20= 99-2=
78-8= 24+30= 80-50= 15+65=
61-21= 59-14= 60-25= 50+26=
67+10 = 15-8= 21 +47= 33+40=
37-17= 46-30= 3+68= 52+9=
31 26 65 73 46 39 63 56 93
个位上是3的数
个位上是6的数
十位上是3的数
36-=6
+50=58
4+ =24
-7=90