文件名称:a-date-of-the-year
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1、输入某一日期，判定该日期为星期几
2、求三角形的面积-To determine whether a date is the first few days of the year
2、求三角形的面积-To determine whether a date is the first few days of the year
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To determine whether a date is the first few days of the year.txt