题目描述

blablabla

样例

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
    double a,b,c,m;
    cin>>a>>b>>c;
    if(a==0||b*b-4*a*c<0)
    cout<<"Impossivel calcular"<<endl;
    else
    m=sqrt(b*b-4*a*c);
    cout<<"R1 = "<<fixed<<setprecision(5)<<(m-b)/(2*a)<<endl;
    cout <<"R2 = "<<fixed<<setprecision(5)<<(m+b)/(2*a)*(-1)<<endl;
}