6-3.4=	160×60=	0.5+2.37=	7.6+2.4=
1.6-0.7=	6÷1000=	0.009×100=	45÷3=

①12.5×3.7×0.8                            
②4.6×2.3+7.7×4.6
③3.6+（5.7+3.8）÷0.5                      
④3.6÷0.4-1.5×3
⑤0.1÷0.2÷0.4                        
⑥80.3-5.6×1.7．

2.5×3.2×1.25
72×87.5+87.5×28
215×

3

7

×0.4×

7

8

3.7×4.6+6.4×3.7-3.7．