已知5⼀6=1⼀2+1⼀3,7⼀12=1⼀3+1⼀4,9⼀20=1⼀4+1⼀5······

利用规律计算:1+1/2-5/6+7/12-9/20+11/30
2025-03-06 18:29:20
推荐回答(1个)
回答1:

1+1/2-5/6+7/12-9/20+11/30-13/42

=1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7
=1-1/7
=6/7