28 +
14 +
12 +
126×
72 ×
36 ×
2 -
56 ×
1
54 ×
16 +
56 ×
180×
8
48 ×
7 +
504×
4 -
7 ÷
3 ÷
16 +
3 ÷
80 ×
7 +
2 ÷
4 -
5 +
252×
18 +
40 ×
56 ×