import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); // 等比数列求和 s(5) f(5) int a1 = in.nextInt(); Double sum5 = a1 * (1 - Math.pow(0.5, 5)) / (1 - 0.5); Double f5 = a1 * Math.pow(0.5, 5); Syste...