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4???A???2?10????3?1??????B???4?5????3?1??????????????????????A????????????B??????????????
5??P????????A?B?C??????????????ABC=90?M?AP?????AB=1?AC=2?AP?2?????MBCA????
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?{f(x)|a?x?a?1}?{f(x)|x?R}??k?????
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