n(n+1)/1= 1-3+5-7+9-11.+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号n(n+1)/1= 1-3+5-7+9-11。+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 22:40:48
![n(n+1)/1= 1-3+5-7+9-11.+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号n(n+1)/1= 1-3+5-7+9-11。+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号](/uploads/image/z/440515-19-5.jpg?t=n%EF%BC%88n%2B1%29%2F1%3D+1-3%2B5-7%2B9-11.%2B97-99%3D+%7C102%2F1-101%2F1%7C%2B%7C103%2F1-102%2F1%7C-%7C103%2F1-101%2F1%7C%3D+%7C+%7C%E6%98%AF%E7%BB%9D%E5%AF%B9%E5%80%BC%E7%AC%A6%E5%8F%B7n%EF%BC%88n%2B1%29%2F1%3D+1-3%2B5-7%2B9-11%E3%80%82%2B97-99%3D+%7C102%2F1-101%2F1%7C%2B%7C103%2F1-102%2F1%7C-%7C103%2F1-101%2F1%7C%3D+%7C+%7C%E6%98%AF%E7%BB%9D%E5%AF%B9%E5%80%BC%E7%AC%A6%E5%8F%B7)
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n(n+1)/1= 1-3+5-7+9-11.+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号n(n+1)/1= 1-3+5-7+9-11。+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号
n(n+1)/1= 1-3+5-7+9-11.+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号
n(n+1)/1= 1-3+5-7+9-11。+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号
n(n+1)/1= 1-3+5-7+9-11.+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号n(n+1)/1= 1-3+5-7+9-11。+97-99= |102/1-101/1|+|103/1-102/1|-|103/1-101/1|= | |是绝对值符号
1/[n(n+1)]=1/n-1/(n+1)
1-3+5-7+9-11.+97-99
=(1-3)+( 5-7)+(9-11)+.+(97-99)
=-2+(-2)+(-2)+.+(-2)
=-2*25
=-50
|102/1-101/1|+|103/1-102/1|-|103/1-101/1|
=1/101-1/102+1/102-1/103-1/101-1/103
=-2/103