直接写出得数。                                                                                                                                      

54.9+4.1=	11.7+2 =	8.7-0.6=	4.3-2.8=
7.31÷100=	25×80=	4.3×1000=	24×5-5=
5元6角2分+3元零8分=	4km800m-3km50m=