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安徽省寿春中学2024年春学期七年级第四次(期末)学科检测试题(数学)试卷答案
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听力原文：Text1M:Mary,whichkindofmusicdoyoulikebetter,poporjazz?W:Well,Ihavenoearformusic.Thetwoarethesametome.Sowhat'syourfavoritekindofmusic?M:Icanneverlistentorockenough.Text2M:Dear,whyareyousoworriedaboutAlex?Didhefailtheexam?W:Notreally.Hedoesn'tstudyhardenough,sohefallsbehindalotfromotherstudents.M:Takeiteasy.I'llgotohisschooltohaveatalkwithhisteacher.Text3W:Jackson,doyoustilllivewithyourparents?M:No.Imovedoutlastmonth.I'vealreadydecidedtoliveonmyown.W:Howcanyouaffordtherent?M:I'vebeenemployedbyanewcompany.Text4W:Sir,don'tforgetyour9:30meetingwiththedirectorsfromallthedepartments.M:Yes,Iremember.Afterthatone-hourmeeting,wewillhaveaten-minutecoffeebreakandthenacallwiththeheadquarters,right?W:Yes,that'sright.Text5M:AkindoffishnamedtheBrazilianGuitarFishisindangerofdyingout.W:Why？Itisterrible！M:Becauseofover-fishing,thenumbershavebeenlargelyreduced.W:Well,inordertoprotectthesearesources,manycountrieshavepassedlawstolimitthefishingseasonandtheamountoffishing.Text6W:Harry,let'splaysomeping-pongtoday.M:I'dlovetoplayasetortwo.Butmyrightarmhurts.I'vedecidedtostopplayingping-ponguntilitfeelsbetter.W:Well,howaboutgoingskating?M:I'dliketo,butmykneehurtstoo.W:Harry,stopmakingexcuses.You'rejustlazy.M:No,I'mnot.YouknowthereisabasketballmatchonTVtoday.Let'sjuststayhomeandwatchit.W:OK,youstay,andIwillplaywithHelen.Text7M:Mom,Dadcalledandsaidthathewouldn'tbehomefordinner.W:Didhesaywhy?M:Yes,hesaidthatoneofthemenwassickandhewasgoingtostayfortheafternoonshift.W:Didhesaywhenhewouldbehome?英语试题参考答案第2页（共6页）
分析先对函数式配方，y=x2-3x+3=（x-$\frac{3}{2}$）2+$\frac{3}{4}$，再根据自变量的范围和函数图象得出值域．
解答解：y=f（x）=x2-3x+3=（x-$\frac{3}{2}$）2+$\frac{3}{4}$，
该函数的图象为开口向上的抛物线，
且对称轴为x=$\frac{3}{2}$，
当x∈[0，3]时，函数先减后增，即，
f（x）min=f（$\frac{3}{2}$）=$\frac{3}{4}$，
f（x）max=f（0）=f（3）=3，
所以，函数的值域为[$\frac{3}{4}$，3]，
故答案为：[$\frac{3}{4}$，3]．
点评本题主要考查了二次函数的图象和性质，涉及图象的对称性单调性和值域，属于基础题．
