15.8+4.2÷2.5 1.25×25×3.2
2005× 17×23×
40%+1.5=
1-25%=
45÷(1-25%)=
60÷20%=
30×(1+20%)=
×33+66×62.5%+0.625 15.72-2.17-1.83
×[÷(-)] -÷2+5
2017× 3.8×25%+6.2×0.25
-+1- (-+)×48
3.75﹣0.63+0.25﹣1.37
21.36÷0.8﹣12.9
0.203dm3=cm3 1.02t=kg