1⼀2*1⼀3+1⼀3*1⼀4+1⼀4*1⼀5+1⼀5*1⼀6 (简便方法)

2024-12-16 13:53:27
推荐回答(1个)
回答1:

1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1/2-1/6
=1/3