1.简便运算 41.2x8.1+11x9.25+53.7x1.9
问题描述:
1.简便运算 41.2x8.1+11x9.25+53.7x1.9
答
41.2x8.1+11x9.25+53.7x1.9
=41.2×(8+0.1)+(10+1)×9.25+53.7×(2-0.1)
=329.6+4.12+92.5+9.25+107.4-5.37
=(329.6+107.4)+92.5+(4.12+9.25-5.37)
=437+92.5+8
=437+100.5
=537.5