Question

c++求一元二次方程组解

Answer 1

#include<iostream.h>
#include<math.h>
int main()
{
double s;
int a,b,c;
cout<<"请依次输入二次项系数a，一次项系数b，常数项c"<<endl;
cin>>a>>b>>c;
s=sqrt(b*b-4*a*c);
if(s>0)
cout<<"x1="<<(-b+s)/2*a*b<<ends<<<<"x2="<<(-b-s)/2*a*b<<endl;
else if(s==0)
cout<<"x1=x2="<<(-b-s)/2*a*b<<endl;
else
cout<<"无实数根"<<endl;

}

Answer 2

#include<iostream>
#include<math.h>
using namespace std;
int main()
{
float a,b,c,disc,x1,x2,p,q;
cin>>a;
cin>>b;
cin>>c;
disc=b*b-4*a*c;
p=-b/(2.0*a);
q=sqrt(disc)/(2.0*a);
if(disc<0)
{
cout<<"无解\n";
}
else if(disc==0)
{
x1=p-q;
cout<<"x1=x2=";
cout<<x1;
}
elsea
{

x1=p+q;x2=p-q;
cout<<x1;
cout<<x2;
}
return 0;
}

Answer 3

出题啊