void fangcheng(double a,double b,double c)
{
double x1,x2;
double delta=b^2-4*a*c;
if(delta>0)
{
x1={-b+sqrt(b^2-4ac)}/2a;
x2=x={-b-sqrt(b^2-4ac)}/2a;
cout
void fangcheng(double a,double b,double c)
{
double x1,x2;
double delta=b^2-4*a*c;
if(delta>0)
{
x1={-b+sqrt(b^2-4ac)}/2a;
x2=x={-b-sqrt(b^2-4ac)}/2a;
cout