2 -
5
6 ×
3
6 +
1
8 ×
4
2
3
2
5
20 ×
1
4
8 ×
2
20 ×
4
7 +
3
5
15 ×
1
1
5
4
6 ×
2
3
4
2 ÷
1
2
3
5