순정평속파인데
이런거는 속벡으로 더 쉽게풀리나 ㅜㅜ
https://gall.dcinside.com/mgallery/board/view/?id=physics2&no=645048&page=1
첫번째꺼 2?
흠
https://gall.dcinside.com/mgallery/board/view/?id=physics2&no=645048&page=1
첫번째꺼 2?
흠