1+1
2
10+10
20
2-1
1
23-19
4
2x3
6
3+4
7
22+15
37
2-2
0
66-50
16
3x3
9
5+6
11
87+12
99
6-4
86-70
5x5
25
3+9
12
37+50
87
9-6
3
33-20
13
10x10
100
7+9
15+15
30
7-4
73-72
7x8
56