简便计算.3.14×31.4+628×0.686+68.6×6.86今晚就要!

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/19 20:08:48
简便计算.3.14×31.4+628×0.686+68.6×6.86今晚就要!简便计算.3.14×31.4+628×0.686+68.6×6.86今晚就要!简便计算.3.14×31.4+628×0.6

简便计算.3.14×31.4+628×0.686+68.6×6.86今晚就要!
简便计算.3.14×31.4+628×0.686+68.6×6.86
今晚就要!

简便计算.3.14×31.4+628×0.686+68.6×6.86今晚就要!
=3.14*100*31.4/100+628*0.686+68.6*10*6.86/10
=314*0.314+628*0.686+686*0.686
=314*0.314+(628+686)*0.686
=314*0.314+1314*0.686
=314*0.314+(314+1000)*0.686
=314*0.314+314*0.686+686
=314+686
=1000

乘法分配律