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教案备课库《作业第86课时线段垂直平分线》真题及答案
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—Wouldyoulike?—Nothanks.Idon'twanttoeat. A.something;something B.something;anything C.anything;anything D.anything;something
Wearesupposedtothefriendshipbecauseitisthetreasureinourlife.valuable
抛物线y=2x2+h的顶点坐标为04则h=．
把抛物线y=2x2-12x+25先向左平移3个单位再向上平移2个单位平移后抛物线的解析式为．
y=x2-4x+10是由y=x2经过怎样的平移得到的
Whatishappenoverthere?Therearesomanypeople.
Chineseinmoreandmorecountriesintheworld. A.teach B.teaches C.istaught D.wastaught
将抛物线y=x2+2向上平移1个单位所得抛物线的解析式是
Sambefamousbecausenobodyknowshim. A.must B.can C.can't D.may
抛物线y=x2+bx+c的图象先向右平移2个单位再向下平移3个单位所得图象的函数解析式为y=x-12-4则bc的值为
古诗中有大漠孤烟直长河落日圆的壮美诗句诗人观察到的落日并非太阳的实际位置而是光线经过不均匀大气时发生了而成的像如图所示太阳实际在图中的填甲或乙位置．
站在岸上的人看到平静的水面下有一静止的物体如图所示他想用一束强光照亮此物体则应瞄准
陶瓷茶杯底部放有一枚硬币人移动到某一位置时看不见硬币如图甲所示往茶杯中倒入一些水后又能够看见硬币了如图乙所示．造成看不见和又看见的原因分别是
April1stisadaytobecarefuloryoucouldeasilygettrickedbysomeone.It'sAprilFools'Dayadaywhenpeopletraditionallyliketotrytomakeafoolofsomeoneelseandlaughatthem. WhatkindoftricksdopeopleplayonAprilFools'Day?Welltherearelotsofsimpletricksthatyoucanplayonyourfriends.Forexampleyoucouldwearablacksweaterandpullapieceofwhitethreadthroughitsothatpeopletrytopullitoff.Youcouldchangethetimeonsomeone'salarmclocksothatthey'relateforwork.Orglueacointothefloortoseehowmanypeopletrytopickitup. Allthesearesmall-scalepracticaljokeswhichyoumightplayononeanotherpersonorafewpeople.Butthere'salsoatraditionoflargecompaniestryingtofoolalotofpeople.Forexampleaburgerrestaurantonceclaimedthattheywereintroducingaleft-handedburger! Radioandtelevisionprogramshavealsofooledmanypeoplebybroadcastingreportswhichareuntree.Oneprogramannouncedtheinventionofanamazingnewweight-lossproduct—akindofwaterwhichcontained包含minuscalories! Andoneofthemostfamoushoaxes骗局everwasbroadcastedbytheBBCitselfin1957!AveryseriousnewsprogramcalledPanoramareportedonthepoorspaghetti意大利面harvestinSwitzerlandandshowedpicturesoffarmerspickingspaghettifromtrees!HundredsofpeopleweretakeninandwrotetotheBBCaskinghowtogrowtheirownspaghetti. 阅读回答问题 1.WhenisAprilFools'Day? 2.Whatdoyouglueacointothefloorfor? 3.HaveTVorradioprogramsfooledpeople? 4.Whatkindoftheproductdidtheyinventtohelploseweightaccordingtoaprogram? 5.Wheredidfarmerspickspaghettiaccordingtothepictures?
如图所示为了捉到一条鱼猩猩用矛拼命地刺向水里却没有成功这主要是由于光的现象造成的．猩猩看到水中的鱼比实际位置要填深或浅一些．
抛物线y=2x2-4与y轴交于点A与x轴交于BC两点点B在点C的左侧求△ABC的面积．
在抛物线y=-x2-3的对称轴的左侧
如图点A是抛物线y=ax2+3第一象限上的一点过点A作AD⊥x轴于点D以AD为边在AD的左侧作正方形ABCD当点B恰好落在抛物线上且正方形ABCD的面积为4那么这个函数解析式为．
如图甲所示在南美原始森林的河流里有一种射水鱼它在水中看到水面上的树枝上停留的昆虫等猎物后便向猎物射水使猎物落在水面上后进行捕杀喷射出的水在空中呈抛物线形状．关于这个情景请你在图乙中画出光路图表示猎物P反射的光线是如何进入鱼的眼睛E的．
将抛物线y=3x2经向下平移k个单位后得到的抛物线经过点1-5求平移后的抛物线解析式并写出对称轴和顶点坐标
在如图所示的四个情景中应用到光的折射原理的是
写出一个顶点坐标为0﹣3开口方向与抛物线y=﹣x2的方向相反形状相同的抛物线解析式．
Whatanicebookitis!ItbelongtoPeterbecausehisnameisonit. A.may B.might C.must D.can't
如图所示光线从一种介质斜射入另一种介质MN是两种介质的分界面其中一种介质是空气则入射角为MN的填左或右侧是空气．
LastweekstudentsatRosieBridgeSchoolworkedhardtomaketheirEnglishWeekverysuccessful. There1alotofactivitiesincludinganEnglishbookfairinthelibraryandatreasurehunt.2studentsputonanEnglishplay.Otherstudents3anEnglishsingingcompetition. Aspeakingcompetitionwasalso4.ThestudentshadtospeakonatopicinEnglish5twominutes. Henrywasthewinnerandwespoketohim.“I'msohappythatI6”hesaid.“Iadvisepeopletospeakslowly.7theywanttobegoodpublicspeakersthey'dbetterspeakclearlyand8.” WealsospoketoseveralotherstudentsaboutEnglishWeek.Oneof9wasAmy. “IreallyenjoyedEnglishWeek.Itgavemeachancetolearnnew10thatIcanuseinmywriting.Inmyopinioneveryschool11haveanEnglishWeek.It'swillworth值得doing”shesaid. OnthelastdayofEnglishWeektheheadteachergavea12tothewholeschool.Hegavestudentssomesuggestionson13toimprovetheirEnglish.“YoushouldcommunicateinEnglishwithyourfriends14youcan.YoushouldreadEnglishbooksandmagazinesandwatchEnglishtelevision15.AboveallyoushouldenjoyEnglish!”hesaid. 1.A.are B.were C.is D.was 2.A.Some B.No C.All D.Few 3.A.tookin B.tookplace C.tookpartin D.tookcareof 4.A.playing B.played C.holding D.held 5.A.on B.at C.for D.by 6.A.did B.won C.lost D.had 7.A.Although B.Since C.Until D.If 8.A.confidently B.quietly C.quickly D.silently 9.A.us B.you C.them D.others 10.A.abilities B.words C.friends D.books 11.A.may B.will C.must D.should 12.A.speech B.decision C.work D.help 13.A.where B.how C.whether D.what 14.A.whoever B.however C.whatever D.whenever 15.A.programmes B.parts C.stars D.stations
在同一坐标系中作y=2x2y=-2x2y=x2的图象它们共同特点是A．都是关于x轴对称抛物线开口向上B．都是关于y轴对称抛物线开口向下C．都是关于原点对称顶点都是原点D．都是关于y轴对称顶点都是原点
二次函数y=2x2-1的图象沿y轴向上平移2个单位所得图象对应的函数表达式为．
抛物线y=-x2+3向下平移4个单位就得到抛物线．
已知二次函数y=ax2+bx+ca≠0的图象如图所示在下列五个结论中①2a-b＜0②abc＜0③a+b+c＜0④a-b+c＞0⑤4a+2b+c＞0错误的个数有
若抛物线y=ax2+ka≠0与y=-2x2+4关于x轴对称则a=k=．
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