11/36
5/9+(3/4-1/2)=5/9+(3/4-2/4)=5/9+1/4=20/36+9/36=29/36
5/9+(3/4-2/4)=5/9+1/4=20/36+9/36=29/36
这已经很简了,还要怎么简算? 5/9 + (3/4 - 2/4) = 5/9 + 1/4 = 29/36