计算:1⼀1x2+1⼀2x3+1⼀3X4+...+1⼀9x10=?

2024-12-26 01:21:12
推荐回答(1个)
回答1:

1/1x2+1/2x3+1/3X4+...+1/9x10
=1-1/2+1/2-1/3+1/3-1/4+……+1/9-1/10
=1-1/10
=9/10