怎么简便怎么算 1⼀1×1⼀2+1⼀2×1⼀3+1⼀3×1⼀4+1⼀4×1⼀5+……1⼀49×1⼀50

2024-12-21 12:17:56
推荐回答(1个)
回答1:

1/1×1/2+1/2×1/3+1/3×1/4+1/4×1/5+……1/49×1/50
=(1-1/2)+(1/2-1/3)+.....+(1/49-1/50)
=1-1/50
=49/50