{"version":"1.0","type":"link","title":"円周率π（Pi）円周率表記【完全記憶術】: 「円周率（π）」を暗記するためにはじめに読むべき一冊 パーフェクトブックシリーズ","provider_name":"JellyFarmの買い物百貨","provider_url":"https://jellyfarm.netlify.app","thumbnail_url":"https://m.media-amazon.com/images/I/51gfDoMmQ2L._SL500_.jpg"}