Question

求一个定积分的值

求一个定积分的值求这个定积分，其中a是正数，谢谢🙏

Answer 1

package zhidao;public class zhidao { public double go(double a, double b) { double retval = 0; double delta = (b - a) / 10000; for(int i = 0; i < 10000; i++) { retval += delta * f(a + (2 * i + 1) * delta / 2 ); } return retval; } public double f(double x) { return x * Math.exp(x); } public static void main(String[] args) { System.out.print(new zhidao().go(1.0, 10.0)); }}