3/5-(2/15+1/3-1/4)=?结果要分数

问题描述:

3/5-(2/15+1/3-1/4)=?
结果要分数

3/5-(2/15+1/3-1/4)
=3/5-2/15-1/3+1/4
=36/60-8/60-20/60+15/60
=(36-8-20+15)/60
=23/60