好的，我来用简便方法计算一下28×26/27+1/27=（27+1）×26/27+1/27=27×26/27+26/27+1/27=26+1=27
解：28x26/27+1/27=28(26/27+1/27-1/27)+1/27=28-28x1/27+1/27=28+(-28/27+1/27)=28-1=27
