①×15×
②÷×
③+×
④(++)×12
⑤÷[(-)×]
0.25=
1.4=
0.123=
1.05=
0.38=
0.055=
3=
0.908=
36×()= ÷3= 25%+(-12.5%)÷=
①
②
③
④2005×
⑤