程序运行时,输入正整数n,求246…*2n的值并输出用Python
sum = 0 n = int( input('请输入正整数n(n>0): ') ) for i in range(2,2*n+1,2): sum += i # sum *= i print('从2到{}之间所有偶数的和为: {}'.format(2*n,sum))