可以运用加法结合律进行计算。0.328+0.47+2.53=0.328+(0.47+2.53)=0.328+3=3.328
0.328+0.47+2.53=0.328+(0.47+2.53)=0.328+3=3.328
你可以先求0.47+2.53，他们加起来等于3可以理解吗？？然后再求
