0.1+0.2+0.3+...+0.8+0.9+0.12+0.14+0.16+...+0.88

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 05:50:01

0.1+0.2+0.3+...+0.8+0.9+0.12+0.14+0.16+...+0.88
0.1+0.2+0.3+...+0.8+0.9+0.12+0.14+0.16+...+0.88

0.1+0.2+0.3+...+0.8+0.9+0.12+0.14+0.16+...+0.88
0.1+0.2+0.3+...+0.8+0.9+0.12+0.14+0.16+...+0.88
= ﹙ 0.1+0.9﹚*9/2+﹙0.12+0.88﹚*39/2
=4.5+19.5
=24

0.1+0.2+0.3+...+0.8+0.9+0.12+0.14+0.16+...+0.98
=(0.1+0.9)*9/2+(0.12+0.98)*44/2
=4.5+24.2
=28.7

原式=[(0.1+0.9)+(0.2+0.8)+…+(0.4+0.6)+0.5]+[(0.12+0.88)+(0.14+0.86)+…+(0.48+0.52)+0.5]
=(1+1+…+1+0.5)+(1+1+…+1+0.5)
=(4+0.5)+(19+0.5)
=4.5+19.5
=24