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환의 넓이(Area of Ring)

作者：민은기 (Min Eun Gi)
主題：面積
환의 넓이(Area of Ring) : https://goo.gl/twBenf  gif : https://goo.gl/EeS4C4 YouTube : https://youtu.be/G_AI-aYEXBc 수학자료실 강의실 : https://goo.gl/czyJLW   YouTube Channel : https://goo.gl/JpzU5i twitter :  https://twitter.com/mineungi

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