闰年的数学解释 Leap Year

【数学之美(23)——闰年的数学解释】
https://m.toutiaocdn.com/group/6686656738134852100/?app=news_article_lite&timestamp=1562862399&req_id=2019071200263801001703822888048D3&group_id=6686656738134852100&tt_from=android_share&utm_medium=toutiao_android&utm_campaign=client_share
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