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:2024/07/02 01:39:41
![1/2+1/6+1/12+1/20+.1/110=?](/uploads/image/z/345648-48-8.jpg?t=1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B.1%2F110%3D%3F)
1/2+1/6+1/12+1/20+.1/110=?
1/2+1/6+1/12+1/20+.1/110=?
1/2+1/6+1/12+1/20+.1/110=?
1/2+1/6+1/12+1/20+.1/110
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+.+1/(10*11)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/10-1/11
=1-1/11
=10/11