某年11月1日是星期3,这个月共上课几天?怎么算,

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zhe ge yue 1 hao shi xing qi 3,na me di yi zhou yao shang 3 tian de ke.11 yue you 30 tian.30-3=27.hai you 27 tian.27/7=3...6,na me yi gong you 3x5+3=18 tian.hai you na ge yu xia de 6,jiu shi 18+5.yi gong shi 23 tian.zhe ge yue yi gong yao du 23 tian de shu.