输入学生课程成绩，求每个学生平均分，求每门课程平均分，输出每个学生每门课程成绩，输出每个学生的平均分，输出每门课程平均分。-Input of the student score, average score for each student, for each course average, each course achievements of the output of each student, output of each student s average output score f