54.2-7/9+4.8-16/9+5/9=
问题描述:
54.2-7/9+4.8-16/9+5/9=
答
54.2-7/9+4.8-16/9+5/9
=(54.2+4.8)+(5/9-7/9-16/9)
=59-18/9
=59-2
=57