数列为:9,99,999,...,9999999999 9 = 10 -1 = 10的1次幂-1; 99 = 100-1 = 10的2次幂-1; 999 = 1000-1 = 10的3次幂-1; ... 9999999999 = 10000000000-1 = 10的10次幂-1; public class Main { public static void main(String[] args) { //write your code here........ long[] arr = new long[10]; long sum =...