1 -
3
10 ×
2
9 +
5
4
3 ×
1
4
5
2 ÷
2
1
3
15 ×
5
3
4 +
1
2 -
2
4
4 ×
1
4
3
2 -
5
10 ×
2
3 +
2
1
4
4
3
5