#include "stdio.h" #include "math.h" double x1,x2,p; float file1(float a,float b) { x1=(-b+sqrt(p))/2*a; x2=(-b-sqrt(p))/2*a; return 0; } float file2(float a,float b) { x1=x2=(-b+sqrt(p))/2*a; return ...