...求当判别式大于,小于,等于0的值,从主函数输入a,b,c的值答:include<stdio.h> include<math.h> float e,f,g,h,i;int main(){ float yishigen(float x,float y);float denggen(float x);float xugen();float a,b,c,p,q,k;scanf("%f,%f,%f",&a,&b,&c);p=-b/(2*a);q=b*b-4*a*c;k=sqrt(q)/(2*a);if(q>0){ yishigen(p+...