直接写出得数。                                                                                                                                      

1.9+7.1=	4.8×0.2=	0.01×90=	75÷100=
3-2.4=	0.12×0.4=	0.5×500=	2.54-1.5=
8×0.5=	4.75+1.05=	6x-2x=	3.2×30=