Assignment 9

After use these online open courseware.
I think MIT OCW is my favorite.
MIT completed the initial publication of virtually the entire curriculum, over 1,950 courses.
And it provide free lecture notes, exams, and videos without registration.
I can learn many language in MIT OCW website,such as German,French,Japanese,Spanish.
It contains assignments and exams.
You can try it and check the answer.
It's very helpful to us.
Others online open courseware also good.
But MIT OCW website is better.