帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/18 18:24:33
![帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?](/uploads/image/z/607703-23-3.jpg?t=%E5%B8%AE%E5%BF%99%E6%83%B3%E4%B8%AA%E9%A2%98%EF%BC%9A%E7%AE%80%E7%AE%97%EF%BC%9A1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B.%2B1%2F110%3D%3F)
帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?
帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?
帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?
1/1-1/2+1/2-1/3+1/3-1/4+.+1/9-1/10+1/10-1/11=10/11
an=1/n(n+1)=1/n-1/(n+1)
S110=1/1-1/111=110/111
1-1/2+1/2-1/3+1/3............+1/10-1/11....=1-1/11 小学六年级不就是这样么?