1.5÷0.75+0.25×40 2025×0.9+202.5
1.37÷0.25÷4 (1.26+0.54)÷(1.5×0.8 )
3.6÷2.5÷0.4 0.18÷0.6+0.85
5.4×62+62×4.6 12.8÷[(19.8-16.6)÷1.6]
12.5×20.24×8 8.8÷(3.2+0.3×4)
0.63×38+62×0.63 5.4÷0.4÷2.5
7.5÷(1.5+7.5×0.6) 1.9-1.9×0.9