3/11+1/12÷1/9+1/4 52*1/9+47÷9+1/9 3/4÷5/3+3/4*2/5 用简便算法怎做

3/11+1/12÷1/9+1/4=3/11+1/12*9+1/4=3/11+3/4+1/4=3/11+1=14/1152*1/9+47÷9+1/9=52*1/9+47*1/9+1/9=(52+47+1)*1/9=100*1/9=100/93/4÷5/3+3/4*2/5=3/4*3/5+3/4*2/5=3/4*(3/5+2/5)=3/4*1=3/4