观察找规律:观察找规律:1/3,2/8,3/15,4/24,……,根据规律,这组数第n个数字与第(n-1)个数字之积的结果是()A.2n+3/(n^2+3n+2)B.1/(n^2+3n+2)C.1/(n^2+n-2)D.1/(n^2+n+2)

问题描述:

观察找规律:
观察找规律:1/3,2/8,3/15,4/24,……,根据规律,这组数第n个数字与第(n-1)个数字之积的结果是()
A.2n+3/(n^2+3n+2)
B.1/(n^2+3n+2)
C.1/(n^2+n-2)
D.1/(n^2+n+2)

答案是 B 第N个数的表达式是n/ (n^2+2n)