/*C语言题,求20以内3的倍数的和sum1,和其它数的和sum2*/ includevoid main(){ int i;int sum1=0,sum2=0;for(i=1;i<=20;i++)if(i%3==0)sum1+=i;else sum2+=i;cout<<"sum1="< 以下是Python函数实现求20以内所有5的倍数之和:def sum_of_multiples_of_5():sum = 0for i in range(...