20.14-20.13+20.12-20.11+20.1-20.09=(20.14-20.13)+(20.12-20.11)+(20.1-20.09)=0.01+0.01+0.01=0.03
20.14-20.13+20.12-20.11+20.1-20.09 =20.14-20.13+20.12-20.11+(20.09+0.01)-20.09 =20.14-20.13+20.12-20.11+0.01+20.09-20.09 =20.14-20.13+20.12-20.11+0.01 =(20+0.14)+(20+0.13)+(20+0.12)+(20+0.11)+0.01 =(20+20+20+20)+(0.14+0.13+0.12+0.11)+0.01 =80+0.5+0.01 =80.51
=2014*20.13-20.12*2014 =2014*(20.13-20.12) =2014*0.01 =20.14
20.13*20.12-201.2*1.011=20.13*20.12-20.12*10.11=(20.13-10.11)*20.12=(10+0.02)*20.12=10*20.12+0.02*20.12=201.6024如果本题有什么不明白可以追问,如果满意请点击右上角好评并“采纳为满意回答”如果有其他问题请采纳本题后,另外发并点击我的头像向我求助,答题不易,请谅解,谢谢.你的采纳是我服务的动力.祝学习进步!O(∩_∩)O,互相帮助,祝新年快乐!
原式=2011*20.1-2011*20.09=2011*20.1-20.09=2011*0.01=20.11
20*10+(0.01+0.09+0.03+0.07+0.05+0.11+.013)=200+(0.1+0.1+0.29)=200.49
20.14x99+20.14=20.14*(99+1)=20.14*100=2014
20.14+13.3-9.14+16.7=(20.14-9.14)+(13.3+16.7)=11+30=41
列式计算27.3+ (57.93-20.09)=27.3+37.84=65.14
法1:基准数法:22.01+20.03+20.05+20.07+20.09+20.11+20.13 =20*7+(0.01+0.03+0.05+0.07+0.09+0.11+0.13)+2=140+(0.11+0.09)+(0.07+0.13)+(0.05+0.03+0.01)+2=140+0.4+0.09+2=142.49法2:等差数列:22.01+