作业帮简便运算:1998+199.8+19.98+1.998+0.1998应该怎么算呢?
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/19 06:24:43
x){ɾ/Oxn6z H@$tה>k{E6IE$ V;j8 !H
40D(23PVHEt`B [-l s|~ʳvLA/M{p'Bk@waӌ$k@s-8ap Wj
简便运算:1998+199.8+19.98+1.998+0.1998应该怎么算呢?
简便运算:1998+199.8+19.98+1.998+0.1998
应该怎么算呢?
简便运算:1998+199.8+19.98+1.998+0.1998应该怎么算呢?
1998+199.8+19.98+1.998+0.1998
=1998(1+0.1+0.01+0.001+0.0001)
=1998*1.1111
=(2000-2)*1.1111
=2222.2-2.2222
=2219.9778
等比数列。。。首项1998 公比0.1
1998(1+0.1+0.01+0.001+0.0001)
1998(1+0.1+0.01+0.001+0.0001)
=2219.9778
等比数列……首项1998 公比0.1