1⼀1x2+1⼀2x3+1⼀3x4+1⼀4x5+......+1⼀98x99+1⼀99x100

用简便运算.
2025-01-01 03:02:23
推荐回答(1个)
回答1:

=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5******+1/98-1/99+1/99-1/100
=1-1/100
=99/100