#include#includeint main()double a,b,c,d,x,x1,x2,sum;printf(/Please enter three number:n);scanf(%lf%lf%lf,&a,&b,&c);sum=a*x*x+b*x+c;sum=0;d=b*b-4*a*c;if(d=0)printf(n);printf(the formular has two similar numbersn); x1=x2=-b/(2*a); printf(x1=%fn x2=%fn,x1,x2); printf(n);else if(d0)printf(n);printf(the formular has two different numbersn);x1=(-b+sqrt(b*b-4*a*c)/(2*a);x2=(-b-sqrt(b*b-4*a*c)/(2*a);printf(x1=%fn x2=%fn,x1,x2);printf(n);else if(d0)printf(n);printf(SORRY:there is no suittable answer in integer,please check them!n); printf(n);printf(n);return 0;判别式小于0的结果:判别式等于0的结果：判别数大于0的结果：