+
1+1=?
2
0-0 =?
0
2+3 =?
5
3-4
-1
4+4 =?
8
50-40 =?
10
5+9 =?
14
76-75 =?
-1
1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000+999 =?
1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000999
123-3 =?
120