3/5-4分之1+2/5减去四分之三的简便方法怎么算3/5-1/4+2/5-3/4=(3/5+2/5)-(1/4+3/4)=1-1=0
3/5-1/4+2/5-3/4=(3/5+2/5)-(1/4+3/4)=1-1=0
2/5+3/5=11-1/4=3/43/4-3/4=0