3 ÷
1 -
4 -
28 ×
3 ÷
1
140×
8 +
24 ×
1 -
4 -
288×
2 ×
56 ×
60 ×
18 +
672×
20 +
2 ÷
140×
13 +
8 ×
23 +
90 ×
7 ×
2
24 +
2 ÷
84 ×
16 +
8
5 +
3 ÷