54.2-(2/9)+4.8-(16/9) = 57 简便计算!

问题描述:

54.2-(2/9)+4.8-(16/9) = 57 简便计算!

54.2-(2/9)+4.8-(16/9)
=(54.2+4.8)-(2/9+16/9)
=59-18/9
=59-2
= 57