1-(1/(2n+1))怎样化简成n/(n+1)

问题描述:

1-(1/(2n+1))怎样化简成n/(n+1)

化简不了.
1-(1/(2n+1))
=(2n+1)/(2n+1)-1/(2n+1)
=[(2n+1)-1]/(2n+1)
=2n/(2n+1)