①
②7.5×8×12.5
③
④193﹣16﹣84
19+23=
5﹣1.6=
0.23÷0.1=
0.4×0.2=
=
÷0.25=
①-+-
②×+÷
③(6﹣1.3×4)÷0.1
④0.4×0.25×8×125
⑤3.4÷[(1.25+0.45)×23]