计算:1除以[1/(2*3)+1/(3*4)+.1/(99*100)=()快

问题描述:

计算:1除以[1/(2*3)+1/(3*4)+.1/(99*100)=()

1除以[1/(2*3)+1/(3*4)+.1/(99*100)
=1/[1/2-1/3+1/3-1/4+...+1/99-1/100]
=1/(1/2-1/100)
=100/49
=2又2/49