比一比,谁聪明

来源：百度知道 编辑：UC知道 时间：2024/06/03 04:00:22
巧算:
51.2乘8.1+11乘9.25+537乘0.19

51.2*8.1+11*9.25+537*0.19
=512*0.81+537*(1-0.81)+11*9.25
=537-0.81*(537-512)+11*9.25
=537-0.81*25+11*(9+0.25)
=537-0.81*25+99+0.11*25
=(537+99)+25*(0.11-0.81)
=(537+100-1)-25*0.7
=636-17.5
=618.5

原式=512*0.81+537*0.19+11*9.25
=512*0.81+512*0.19+25*0.19+11*9.25
=512+25*0.2-25*0.01+10*9.25+9.25
=517-0.25+92.5+9.25
=618.5

（51.2*8.1）+（11*9.25）+（537*0.19）
=414.72+101.75+102.03
=618.5

512*0.81+537*0.19+11*9.25
=512*0.81+512*0.19+25*0.19+11*9.25
=512+25*0.2-25*0.01+10*9.25+9.25
=517-0.25+92.5+9.25
=618.5