Current location - Training Enrollment Network - Mathematics courses - How is the limit line of clamping criterion of advanced mathematics for postgraduate entrance examination deduced?
How is the limit line of clamping criterion of advanced mathematics for postgraduate entrance examination deduced?
The specific process is that when i= 1, 2, …, n, ∑1[n+(I+1)? /n]= 1/[n+2？ /n]+ 1/[n+3？ /n]+…+ 1/[n+n？ /n]+ 1/[n+(n+ 1)？ /n]①.
So, add 1/[n+ 1? /n], minus 1/[n+ 1? /n] and write it as 1, 2, ... Me too. ① The formula can be expressed as "∑1[n+(I+1)"? /n]=∑ 1/[n+i？ /n]- 1/[n+ 1？ /n]+ 1/[n+(n+ 1)？ /n].