```cpp

include[HTML_REMOVED]

include[HTML_REMOVED]

include[HTML_REMOVED]

using namespace std;
int main(){
double a,b,c;
cin>>a>>b>>c;
if((bb-4ac)<0||a==0){
printf(“Impossivel calcular”);
}
else{
printf(“R1 = %.5lf\nR2 = %.5lf\n”,(-b+sqrt(bb-4ac))/(2a),(-b-sqrt(bb-4ac))/(2*a));//分母记得括起来！！
}
return 0;
}