3x5-8+1
-1+2-3x4-5+6-7+8
(3x5)-(8+2)
17-3x(5-2)
10/5-1
10/(5-1x4)
5-2x2/4
1-2+3x4+5-6+7-8
6
9
-9
5
8
1
4
10
