题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
a=int(input()) sum=2*a+3*sum([n for n in range(a)]) print(sum) #2+3*0,2+3*1,2+3*2
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
a=int(input()) sum=2*a+3*sum([n for n in range(a)]) print(sum) #2+3*0,2+3*1,2+3*2
相关推荐