题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
while 1: try: n = int(input()) print(int(n*2 + n*(n-1)*3/2)) #等差数列求和公式,s = n*a1 + n*(n-1)*d/2 except: break
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
while 1: try: n = int(input()) print(int(n*2 + n*(n-1)*3/2)) #等差数列求和公式,s = n*a1 + n*(n-1)*d/2 except: break
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