21.5÷0.5×6
5.3×4.72+0.53×52.8
0.175÷0.25÷0.4
15.89+(6.75-5.89)
5.17-1.8-3.2
13.75-(6.48+3.75)
3.68+7.56-2.68
7.85-(2.34-0.15)
35.6-1.8-15.6-7.2
213.6÷0.8÷0.3
32.8×10.5÷0.6
16.5÷5.5×1.7