int[][] scores = {        { 82, 90, 91 },        { 68, 72, 64 },        { 95, 91, 89 },        { 67, 52, 60 },        { 79, 81, 85 },};// TODO:double average = 0;double sum = 0;double num = 0;System.out.println(average);for (int i=0;i<scores.length;i++){    for (int j=0;j<scores[i].length;j++){        sum += scores[i][j];        num += 1;        System.out.println("成绩："+scores[i][j]+",sum="+sum);    }}average = sum/num;