1-5/12+8/15+1/12-13/15-29/20

来源：学生作业帮助网编辑：作业帮时间：2024/05/10 02:50:06

1-5/12+8/15+1/12-13/15-29/20
1-5/12+8/15+1/12-13/15-29/20

1-5/12+8/15+1/12-13/15-29/20
1-5/12+8/15+1/12-13/15-29/20
=1-5/12+1/12+8/15-13/15-1-9/20
=-4/12-5/15-9/20
=-1/3-1/3-9/20
=-(20+20+27)/60
=-67/60
=-1(7/60)