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1 . ??????6????????????5(1) ?????????????????
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1)?A=??,??B=?1,2?,?1??;
2)?A=?1??,B=?2??B=?1,2?,?2??;
3)?A=?2??,B=?1??B=?1,2?,?2??;
4)?A=?1,2??,B=???1???2???1,2?,?4??.
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???: ?A?B?????,??????(1?2)??,????????????,????????:?1??1,???A???B,????B???A,??????A???B,?3???;?2??2,???3???.??????????33=9???,?????9??.
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发表于 2019-9-13 23:46:11