abs(x)+abs(y)<1

저자:
민은기 (Min Eun Gi)
abs(x)+abs(y)<1 : https://goo.gl/ryMbN4  YouTube :  https://youtu.be/8DkdKWPM84Q 수학자료실 강의실 : https://goo.gl/czyJLW   YouTube Channel : https://goo.gl/JpzU5i twitter :  https://twitter.com/mineungi