祥平君
https://images.plurk.com/4Em2DGiyyV4qhNUK3MEEob.jpg https://images.plurk.com/6IyiOk69Yg56p7PNJHyFOR.jpg https://images.plurk.com/23FfiH3hx935DuzaDndMzQ.jpg https://images.plurk.com/5dsqCkEVfpAlpsCfbY2q8.jpg
數學系的蛋糕切成三等份大賽