有一个班有4个学生，5门课程。

①求第一门课程的平均分；

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以及平均成绩；

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3个要求。-There is a class has four students, five courses.

① seeking first course of average

② identify two or more students who do not pass the course, the output of their student number and all course grades and grade point average

③ find the average score of 90 points or more or all of the course grade students at 85 points or more.

Were compiled three functions to achieve the above three requirements.