C语言:输出分数序列2/3,3/5,5/9,9/15,15/25,...的前50项(10个一行)及...答:int main(int argc,char *argv[]){ int n,i;__int64 a,b;double s,t;for(a=2,b=3,s=n=i=0;i<50;i++){ printf(++n%10 ? "%10f" : "%10f\n",t=a/(b+0.0));b+=a,a=b-a,b+=!(b&1);s+=t;} printf("\nThe SUM are %f\n",s);return 0;} (6位小数...