#include<iostream>
#include<iomanip>
using namespace std;
double a,b,c,d,x,s=0;
int main(){
	cin>>x>>a>>b>>c>>d;
	s=a*x*x*x+b*x*x+c*x+d;
	cout<<fixed<<setprecision(7)<<s;
	return 0;
}

标准答案，可以抄袭： #include #include using namespace std;

int main() { double a, b, c, d, x; cin >> x >> a >> b >> c >> d; double mul = a * x * x * x + b * x * x + c * x + d; cout << fixed << setprecision(7) << mul << endl; return 0; }

#include <iostream>
using namespace std;
int main()
{
	double a, b, c, d, x;
	cin >> x >> a >> b >> c >> d;
	cout << fixed << setprecision(7) << a * x * x * x + b * x * x + c * x + d << endl;
	return 0;
}

9行

//10行代码，完美解决
#include<iostream>
#include<iomanip>
using namespace std;
double a,b,c,d,x,s=0;
int main(){
	cin>>x>>a>>b>>c>>d;
	s=a*x*x*x+b*x*x+c*x+d;
	cout<<fixed<<setprecision(7)<<s;
	return 0;
}
//you can copy it

#include #include using namespace std; int main(){ double a,b,c,d,x,y; cin>>x>>a>>b>>c>>d; y=axxx+bxx+cx+d; cout<<fixed<<setprecision(7)<<y; return 0; }

题解 #include

using namespace std; int main(){ double a , b , c , d , x , l; cin >> x >> a >> b >> c >> d; l = a * x * x * x + b * x * x + c * x + d; printf("%.7f" , l); return 0; }

#include<iostream>
#include<iomanip>
using namespace std;
long double f(long double x,
long double a,long double b,
long double c,long double d){
	return a*x*x*x+b*x*x+c*x+d;
}
int main(){
	long double a,b,c,d,x;
	cin>>x>>a>>b>>c>>d;
	cout<<setprecision(7)<<fixed<<f(x,a,b,c,d);
}