解:0.1+0.2+0.3+········+0.87+0.88+0.89
=(0.1+0.9)×9÷2+(0.10+0.89)×80÷2
=4.5+39.6
=44.1
你好,题目有问题哦
因为前面是一位小数,后面是两位小数,也就是不存在规律
没法计算哦
请检查后追问我一下,我帮你解答
0.01+0.02+0.03+········+0.87+0.88+0.89
(0.01+0.89)×89÷2
=0.9×89÷2
=80.1÷2
=40.05
[(0.1+0.89)/2]*89=40.5