5.4÷(3.94+6.86)
(3.2+0.24)÷0.8
0.175÷0.25×4
0.875÷0.125÷8
37.5÷2.5÷0.6 48÷(8.57-5.37)
7.89×1.94-2.89×1.94 73.5+26.5÷2.5
28.