有一个班4个学生，5门课程。

1.求第一门课程的平均成绩；

2.找出有2门以上课程不及格的学生，

输出他们的学号和全部课程成绩及平均成绩

3.找出平均成绩在90分以上或全部课程成绩

在85分以上的学生。

分别编3个函数实现以上要求。-There is a class four student, five courses. 1 find the first course, the average score　2 identify two or more courses the student does not pass, the output number and their full course of study results and the average score 3 to find out the average score of 90 points or more or all of the courses score 85 points or more students. Three functions were incorporated to achieve the above requirements.