简便计算过程如下3/5+3/5-1/2=6/5-1/2=12/10-5/10=7/101-(3/4-3/10)=1-3/4+3/10=1/4+3/10=10/40+12/40=22/40=11/20望采纳
脱式计算3/5+3/5-1/2=6/5-1/2=12/10-5/10=7/10 1-(3/4-3/10)=1-(15/20-6/20)=1-9/20=11/20