#include <iomanip> using namespace std; int main() { double x, a, b, c, d; cin >> x >> a >> b >> c >> d; // 计算 f(x) = a*x^3 + b*x^2 + c*x + d double result = a * x * x * x + b * x * x + c * x + d; // 设置输出精度为小数点后5位 cout << fixed << setprecision(5) << result << endl; return 0; }