using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication6 { class Program { static void Main(string[] args) { //输入x,计算关于x的一元多次方程的值 double x, y; Console.Write("x="); x = Convert.ToDouble(Console.ReadLine()); y = Math.Pow(x, 3) + 2*Math.Pow(x, 2) + 8 * x - 9; Console.WriteLine("x^3-2*x^2+8*x-9=" + y); } } }