四分之三减0.6乘(二又十二分之五减1.75)等于多少,

问题描述:

四分之三减0.6乘(二又十二分之五减1.75)等于多少,

3/4-0.6×(29/12-1.75)
=3/4-3/5×(29/12-7/4)
=3/4-3/5×(29/12-21/12)
=3/4-3/5×2/3
=3/4-2/5
=15/20-8/20
=7/20

3/4-0.6×﹙2+5/12-1.75﹚=0.75-0.6×﹙29/12﹚+0.6×1.75=0.75-1.45+1.05=1.75+1.05-1.45=0.35