2+1.9-1.8+1.7-1.6+...+0.3-0.2+0.1

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 08:33:32

2+1.9-1.8+1.7-1.6+...+0.3-0.2+0.1
2+1.9-1.8+1.7-1.6+...+0.3-0.2+0.1

2+1.9-1.8+1.7-1.6+...+0.3-0.2+0.1
2+1.9-1.8+1.7-1.6+...+0.3-0.2+0.1
=2+(1.9-1.8)+(1.7-1.6)+...+(0.3-0.2)+0.1
=2+10x0.1
=3

=2.6

2+(1.9+0.1)-(1.8+0.2)+(1.7+03)-````````+(1.1+0.9)-1=2+2-1=3

算法这样:2+(1.9-1.8)+(1.7-1.6)+....(0。3-0.2)+0.1
=3