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如图,O为△ABC的外心,AB=4,AC=2,∠BAC为钝角,M是边BC的中点,则的值( )
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高三下学期数学《》真题及答案
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BillDraytonbelieveswe'reinthemiddleofanecessarybutpainfulhistoricaltransition.Formillenniumsmostpeople'sliveshadacertain1.Youwenttoschooltolearnatradeoraskill﹣bakingfarmingoraccounting.Thenyoucouldgointotheworkforceandmakeagoodlivingrepeatingthesameskilloverthecourseofyourcareer. Butthesedaysmachinescandoprettymuchanythingthat's2.Thenewworldrequiresadifferentsortofperson.Draytoncallsthisnewsortofpersonalchangemaker. Changemakersarepeoplewhocanseethepatternsaroundthemidentifytheproblemsinanysituationfigureoutwaystosolvetheproblemsinanysituationfigureoutwaystosolvetheproblemorganizefluidteamsleadcollectiveactionandthen3adaptassituationschange. ForexampleAshokafellowAndrésGallardoisaMexicanwholivedinahighcrimeneighborhood.HecreatedanappcalledHausthatallowspeopleto4withtheirneighbors.Theapphasapanicbuttonthat5everybodyintheneighborhoodwhenacrimeishappening.Itallowsneighborstoorganizechatsharecrimestatisticsandworktogether. ToformandleadthiscommunityofcommunitiesGallardohadtopossesswhatDraytoncallscognitiveempathy﹣basedlivingforthegoodofall.Congnitiveempathyistheabilitytoperceivehowpeoplearefeelingin6circumstances.Forthegoodofallisthecapacitytobuildteams. Itdoesn'tmatterifyouareworkinginthecafeteriaortheinspectionlineofaplantcompanieswillnowonlyhirepeoplewhocan7problemsandorganizeresponses. Millionsofpeoplealreadylivewiththemind﹣set.Butalotofpeoplestillinhabittheworldoffollowingrulesandrepetitiveskills.TheyhearsocietytellingthemWedon'tneedyou.Wedon'tneedyourkidseither.Ofcoursethosepeoplegointoreactionarymodeandstrikeback. Thecentral8ofourtimeDraytonsaysistomakeeveryoneachangemaker.Inanearliererahesayssocietyrealizeditneededuniversal9.Todayschoolshavetodevelopthecurriculumsandassessmentstomakethechangemakingmentalityuniversal.Theyhavetounderstandthisistheircriteriaforsuccess. Ashokahasstudiedsocialmovementstofindouthowthiskindof10shiftcanbepromoted.Itturnsoutthatsuccessfulmovementstakesimilarsteps.
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