观察下列等式:1⼀1x2=1-1⼀2,1⼀2x3=1⼀2-1⼀3,1⼀3x4=1⼀3-1⼀4

2024-10-28 23:37:29
推荐回答(1个)
回答1:

  1. 1/n-1/(n+1)

  2. 2009/2010