找规律填数1⼀3,1⼀2,5⼀9,7⼀12,3⼀5,11⼀18

2024-12-23 04:30:52
推荐回答(2个)
回答1:

1/3,1/2,5/9,7/12,3/5,11/18,(13/21),(5/8)

1/3,3/6,5/9,7/12,9/15,11/18

an=(2n-1)/3n

回答2:

(2n-1)/3n