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天舟高考衡中同卷案调研卷2024答案(湖南专版)三数学.考卷答案试卷答案
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omPoonlardahethe第二节（满分25分阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文
AsGoodAsYouWhenJenna'staekwondo(instructor,Ms.Baroni,introducedMarti,Jenna'sbestfriend,toeveryone,JennawassoexcitedthatMartiwouldbetakinglessonswithher.Classstartedwithwarm-upexercises,andthenMs.Baronidividedeveryoneintocolor-beltgroups.SeeingMartibecomeredinfaceandplaywiththeedgeofhershirt,Ms.Baronitoldthefriendstoworktogether,eventhoughJennawasayellowbeltandalevelaboveMarti,makingMartilessnervousonherfirstday.ItsuitedJennafine.Shecouldn'twaittodemonstratesomebasickickstoMarti.MarticopiedherkickashighasJenna'sshoulder."Greatjob,Marti!"saidMs.Baroni,whohadwalkedupbehindthem.ShethenspentthenextfiveminutesworkingwithMarti,teachingherhowtostraightenherlegandsnapherfootouttomakethelegsformasquare.JennacollapsedagainstthewallandwatchedMarticopyeverythingMs.Baronidid.ThemoreMartidid,themorepraisesheearnedfromMs.Baroni,andsothemorehalfheartedlyJennapracticed.WhatifMartibecamebetterthanher?WhatifMartibecameMs.Baroni'sfavoritestudent?"Watchyourform!"WhoisMs.Baroniscolding?Jennawondered.SheturnedandsawMs.Baronilookingdirectlyather.Nothingcouldhavebeenworse."Jenna,yoursidekickcouldbebetterthanthat",saidMs.Baroniwithaslightfrown,"You'vememorizedyourformperfectly,butyourmovesaresloppy（马虎的).Makethelegsfullyextended,pointthetoesdownward,andtryagain."Attheendoftheclass,Jennagrabbedherbagandhurriedoutsidetofindhermom.Shehadplannedtowaitandsaygood-byetoMarti,butnowshewantedtobealone.Forthenextseveralweeks,Marticontinuedtoimpresstheirteacherwithherskills.AndasMartitumedintoastarstudent,Jennabecamelessandlessexcitedabouttaekwondo.注意：1.续写词数应为150左右；2.请按如下格式在答题卡的相应位置作答
Oneday,MartiexcitedlytoldJennathatMs.Baroniwantedhertobetestedforanewbelt.WhenMartifinishedherform,Jennathoughtitlookedperfect.英语测试题第10页（共10页）
分析利用配方法求解函数的解析式即可．
解答解：$f（x+\frac{1}{x}）={x^2}+\frac{1}{x^2}$=${（x+\frac{1}{x}）}^{2}-2$，
∴f（x）=x2-2（|x|≥2）．
故选：C．
点评本题考查函数的解析式的求法，注意函数的定义域．
