362+127+173+238=(362+238)+(127+173)=600+300=900
362+127+173+238=362+238+127+173=600+300=900
=(362+238)+(127+173)=600+300=900
凑整,362+127+173+238=(362+238)+(127+173)=600+300=900
=173+127+238+362=300+600=900