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书面表达Onepossibleversion:NOTICEAsportsmeetingwillbeheldintheplaygroundofourschoolfromnextThursdaytoFridayAsyouknow,thepressureofstudyisveryheavynow,especiallyforthosesenior3.Sothepurposeofthesportsmeetingistoleteverystudentgetrelaxed,asaresultofwhichwestudentscanlivehappilyandhealthilyEveryoneiswelcometotakepartinit.Thosewhoperformexcellentlyatthesportsmeetingwillgetprizes.Butdon'ttaketheresultssoserouslybecausetakingpartismoreimportantthantheresult.Goodlucktoeveryone!
31.答案:2解析:如图所示,因为F1A=AB,所以A为F1B的中点.又O为F1F2的中点所以AO∥aBF2,AO=aBF2因为F1B·F2B=0,所以∠F1BF2且O为F1F2的中点,所以OB90°,FIF2=OF2=c由AO∥BF2得∠OBF2=∠AOF1=∠BF2F1,所以OB=BF2,因此△OBF2为等边三角形,∠BOF2=60°,即渐近线的斜率为3,也即一=3,所以e
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