六年级奥术题 简便计算

41.2*8.1+11*9.25+53.7*1.9
=41.2*(10-1.9)+(10+1)*9.25+53.7*1.9
=412-41.2*1.9+92.5+9.25+53.7*1.9
=(53.7-41.2)*1.9+412+92.5+9.25
=12.5*(2-0.1)+412+92.5+9.25
=25-1.25+412+92.5+9.25
=25+412+92.5+(9.25-1.25)
=437+92.5+8
=437+100.5
=537.5

41.2*8.1+11*9.25+53.7*1.9
=41.2*8.1+11*9.25+(41.2+12.5)*1.9
=41.2*8.1+11*9.25+41.2*1.9+12.5*1.9
=41.2*(8.1+1.9)+11*9.25+12.5*1.9
=412+11*9.25+1.25*19
=412+11*(1.25+8)+1.25*19
=412+11*1.25+11*8+1.25*19
=412+1.25*(11+19)+11*8
=412+37.5+88
=537.5
题目真难啊

41.2*8.1+11*9.25+53.7*1.9
=333.72+101.75+102.03
=537.5