1-(5/12)+(5/4)+(1/12)-(14/15)-(39/20)

问题描述:

1-(5/12)+(5/4)+(1/12)-(14/15)-(39/20)
一定要简算

=1-(5/12+1/12)+(5/4)-(14/15)-(39/20)
=(60/60)-(30/60)+(75/60)-(56/60)-(108/60)
=(60-30+75-56-108)/60
=-59/60