题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
''' n=int(input()) series=[2+3*i for i in range(n)] summay=sum(series) print(summay) ''' n=int(input()) print(int((2+2+3*(n-1))*n/2))
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
''' n=int(input()) series=[2+3*i for i in range(n)] summay=sum(series) print(summay) ''' n=int(input()) print(int((2+2+3*(n-1))*n/2))
相关推荐