1⼀1*2+1⼀2*3+1⼀3*4+1⼀4*5+......+1⼀n(n+1)

计算,马上解答!
2024-11-26 13:46:04
推荐回答(1个)
回答1:

=1-1/2+1/2-1/3……+1/n-1/(n+1)
=1-1/(n+1)