编写函数fun,函数的功能是:求一分数序列 2/1,3/2,5/3,8/5,13/8,21/...答:float suma(int n){ float ft =0;int i,at,bt;int a1=2,b1=1,a2=3,b2=2;if(n <2){ printf("输入数小于2!");return ft;} for(i=2;i<=n;i++){ ft = a1/b1 + a2/b2;at = a1 + a2;bt = b1 + b2;a1 = a2;b1 = b2;a2 = at;b2 = bt;} return ft;} ...