方程求解

#include <iostream>
#include <cmath>//使用#include <cmath>时必须声明在std命名空间：using namespace std;




using namespace std;

int main()
{
    float a,b,c,x1,x2;

    cin >> a >> b >> c;

    x1 = ( -b + sqrt( b * b - 4 * a * c ) ) / ( 2 * a );
    x2 = ( -b - sqrt( b * b - 4 * a * c ) ) / ( 2 * a );

    cout << " x1 = " << x1 << endl ;
    cout << " x2 = " << x1 << endl ;
    
    return 0;
}